IP Library › Granted Patent US 12,439,814
Granted Patent B2
US 12,439,814 · App. 18/606,779 · Granted Oct 7, 2025

Light-emitting element, light-emitting device, display device, electronic appliance, and lighting device

Inventors: Satoshi Seo (Kanagawa, JP); Hiromi Seo (Kanagawa, JP); Tatsuyoshi Takahashi (Kanagawa, JP); Takahiro Ishisone (Kanagawa, JP)
Assignee: Semiconductor Energy Laboratory Co., Ltd.
H10K85/342H10K50/11H10K50/13H10K50/81H10K50/82H10K85/633H10K85/636H10K85/6572H10K85/6576H10K85/341H10K85/346H10K85/615H10K85/624H10K85/626H10K2101/10H10K2101/20H10K2101/25H10K2101/27H10K2101/90
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Quick Facts
Patent No.
US 12,439,814
App. No.
18/606,779
Granted
Oct 7, 2025
Kind
B2
Abstract

A multicolor light-emitting element using fluorescence and phosphorescence, which has a small number of manufacturing steps owing to a relatively small number of layers to be formed and is advantageous for practical application can be provided. In addition, a multicolor light-emitting element using fluorescence and phosphorescence, which has favorable emission efficiency is provided. A light-emitting element which includes a light-emitting layer having a stacked-layer structure of a first light-emitting layer exhibiting light emission from a first exciplex and a second light-emitting layer exhibiting phosphorescence is provided.

Claims (51)

1. A light-emitting element comprising:

an anode;

a hole-transport layer over the anode;

a first light-emitting layer over the hole-transport layer, the first light-emitting layer comprising a first organic compound and a phosphorescent compound;

a second light-emitting layer over and in contact with the first light-emitting layer, the second light-emitting layer comprising a second organic compound and a third organic compound;

an electron-transport layer over the second light-emitting layer; and

a cathode over the electron-transport layer,

wherein each of a triplet excited level of the second organic compound and the third organic compound is higher than a triplet excited level of the phosphorescent compound,

wherein a combination of the second organic compound and the third organic compound forms a first exciplex,

wherein light emitted from the first light-emitting layer has an emission peak at 600 nm to 700 nm, and

wherein light emitted from the second light-emitting layer has an emission peak at 500 nm to 600 nm.

2. The light-emitting element according to claim 1 , wherein the second light-emitting layer further comprises a dopant.

3. The light-emitting element according to claim 2 , wherein the dopant is a light-emitting substance.

4. A light-emitting module including the light-emitting element according to claim 1 , the light-emitting module comprising:

a current controlling transistor electrically connected to the light-emitting element.

5. A display module including the light-emitting element according to claim 1 in a display portion, the display module comprising:

a current controlling transistor electrically connected to the light-emitting element.

6. A lighting device including the light-emitting element according to claim 1 .

7. A light-emitting device comprising:

the light-emitting element according to claim 1 ; and

a current controlling transistor electrically connected to the light-emitting element.

8. A display device comprising:

the light-emitting element according to claim 1 in a display portion; and

a current controlling transistor electrically connected to the light-emitting element.

9. An electronic appliance comprising the light-emitting element according to claim 1 .

10. A light-emitting element comprising:

an anode;

a hole-transport layer over the anode;

a first light-emitting layer over the hole-transport layer, the first light-emitting layer comprising a first organic compound and a phosphorescent compound;

a second light-emitting layer between the hole-transport layer and the first light-emitting layer, the second light-emitting layer comprising a second organic compound and a third organic compound;

an electron-transport layer over the second light-emitting layer; and

a cathode over the electron-transport layer,

wherein the second light-emitting layer is in contact with the first light-emitting layer,

wherein each of a triplet excited level of the second organic compound and the third organic compound is higher than a triplet excited level of the phosphorescent compound,

wherein a combination of the second organic compound and the third organic compound forms a first exciplex,

wherein light emitted from the first light-emitting layer has an emission peak at 600 nm to 700 nm, and

wherein light emitted from the second light-emitting layer has an emission peak at 500 nm to 600 nm.

11. The light-emitting element according to claim 10 , wherein the second light-emitting layer further comprises a dopant.

12. The light-emitting element according to claim 11 , wherein the dopant is a light-emitting substance.

13. A light-emitting module including the light-emitting element according to claim 10 , the light-emitting module comprising:

a current controlling transistor electrically connected to the light-emitting element.

14. A display module including the light-emitting element according to claim 10 in a display portion, the display module comprising:

a current controlling transistor electrically connected to the light-emitting element.

15. A lighting device including the light-emitting element according to claim 10 .

16. A light-emitting device comprising:

the light-emitting element according to claim 10 ; and

a current controlling transistor electrically connected to the light-emitting element.

17. A display device comprising:

the light-emitting element according to claim 10 in a display portion; and

a current controlling transistor electrically connected to the light-emitting element.

18. An electronic appliance comprising the light-emitting element according to claim 10 .

Priority Claims (1)
JP JP2012-173027 · Aug 3, 2012 · national
Continuity (7)
Continuation 17733025 · Apr 29, 2022
Continuation 17113238 · Dec 7, 2020
Continuation 16516987 · Jul 19, 2019
Continuation 15592485 · May 11, 2017
Continuation 14738112 · Jun 12, 2015
Continuation 13955904 · Jul 31, 2013
Related Publication 20240276753A1 · Aug 15, 2024
References Cited (174)
US 6863997B2 · Thompson et al. · 2005 [cited by applicant]
US 6869695B2 · Thompson et al. · 2005 [cited by applicant]
US 6951694B2 · Thompson et al. · 2005 [cited by applicant]
US 7175922B2 · Jarikov et al. · 2007 [cited by applicant]
US 7183010B2 · Jarikov · 2007 [cited by applicant]
US 7329984B2 · Nagara et al. · 2008 [cited by applicant]
US 7332857B2 · Seo et al. · 2008 [cited by applicant]
US 7553557B2 · Thompson et al. · 2009 [cited by applicant]
US 7572522B2 · Seo et al. · 2009 [cited by applicant]
US 7597967B2 · Kondakova et al. · 2009 [cited by applicant]
US 7943925B2 · Yamazaki · 2011 [cited by applicant]
US 7993760B2 · Komori et al. · 2011 [cited by applicant]
US 8021574B2 · Kawamura et al. · 2011 [cited by applicant]
US 8025815B2 · Kawamura et al. · 2011 [cited by applicant]
US 8029697B2 · Kawamura et al. · 2011 [cited by applicant]
US 8034256B2 · Kawamura. et al. · 2011 [cited by applicant]
US 8034465B2 · Liao et al. · 2011 [cited by applicant]
US 8154195B2 · Nishimura et al. · 2012 [cited by applicant]
US 8211552B2 · Nishimura et al. · 2012 [cited by applicant]
US 8221907B2 · Kawamura et al. · 2012 [cited by applicant]
US 8247086B2 · Inoue et al. · 2012 [cited by applicant]
US 8274214B2 · Ikeda et al. · 2012 [cited by applicant]
US 8294142B2 · Nishimura et al. · 2012 [cited by applicant]
US 8330350B2 · Nishimura et al. · 2012 [cited by applicant]
US 8436343B2 · Nishimura et al. · 2013 [cited by applicant]
US 8513658B2 · D'Andrade et al. · 2013 [cited by applicant]
US 8568903B2 · Kawamura et al. · 2013 [cited by applicant]
US 8587192B2 · Nishimura et al. · 2013 [cited by applicant]
US 8779655B2 · Nishimura et al. · 2014 [cited by applicant]
US 8853680B2 · Yamazaki et al. · 2014 [cited by applicant]
US 8901539B2 · Shibata et al. · 2014 [cited by applicant]
US 8963127B2 · Pieh et al. · 2015 [cited by applicant]
US 8981355B2 · Seo · 2015 [cited by applicant]
US 8993129B2 · Endo et al. · 2015 [cited by applicant]
US 8994263B2 · Shitagaki et al. · 2015 [cited by applicant]
US 9054317B2 · Monkman et al. · 2015 [cited by applicant]
US 9059421B2 · Seo et al. · 2015 [cited by applicant]
US 9082995B2 · Nishimura et al. · 2015 [cited by applicant]
US 9159942B2 · Seo et al. · 2015 [cited by applicant]
US 9175213B2 · Seo et al. · 2015 [cited by applicant]
US 9356250B2 · Ohsawa et al. · 2016 [cited by applicant]
US 9604928B2 · Shitagaki. et al. · 2017 [cited by applicant]
US 9660211B2 · Seo et al. · 2017 [cited by applicant]
US 9711745B2 · Yamazaki · 2017 [cited by applicant]
US 10177329B2 · Kim et al. · 2019 [cited by applicant]
US 10361389B2 · Seo et al. · 2019 [cited by applicant]
US 10665808B2 · Seo et al. · 2020 [cited by applicant]
US 10862059B2 · Seo et al. · 2020 [cited by applicant]
US 11322709B2 · Seo et al. · 2022 [cited by applicant]
US 11937439B2 · Seo · 2024 [cited by examiner]
US 20030124381A1 · Thompson et al. · 2003 [cited by applicant]
US 20030175553A1 · Thompson. et al. · 2003 [cited by applicant]
US 20050048310A1 · Cocchi et al. · 2005 [cited by applicant]
US 20050221116A1 · Cocchi et al. · 2005 [cited by applicant]
US 20060134464A1 · Nariyuki · 2006 [cited by applicant]
US 20060228577A1 · Nagara · 2006 [cited by applicant]
US 20070090756A1 · Okada et al. · 2007 [cited by applicant]
US 20070194701A1 · Ito et al. · 2007 [cited by applicant]
US 20070244320A1 · Inoue et al. · 2007 [cited by applicant]
US 20080160345A1 · Inoue et al. · 2008 [cited by applicant]
US 20080286604A1 · Inoue et al. · 2008 [cited by applicant]
US 20090045731A1 · Nishimura et al. · 2009 [cited by applicant]
US 20090091255A1 · Lee et al. · 2009 [cited by applicant]
US 20100052527A1 · Ikeda et al. · 2010 [cited by applicant]
US 20100145044A1 · Inoue et al. · 2010 [cited by applicant]
US 20100171109A1 · Nishimura et al. · 2010 [cited by applicant]
US 20100331585A1 · Kawamura et al. · 2010 [cited by applicant]
US 20110001146A1 · Yamazaki et al. · 2011 [cited by applicant]
US 20110210316A1 · Kadoma et al. · 2011 [cited by applicant]
US 20110215309A1 · D'Andrade et al. · 2011 [cited by applicant]
US 20110215714A1 · Seo et al. · 2011 [cited by applicant]
US 20120097998A1 · Pieh et al. · 2012 [cited by applicant]
US 20120098417A1 · Inoue et al. · 2012 [cited by applicant]
US 20120205632A1 · Shitagaki et al. · 2012 [cited by applicant]
US 20120205687A1 · Yamazaki et al. · 2012 [cited by applicant]
US 20120206035A1 · Shitagaki et al. · 2012 [cited by applicant]
US 20120217486A1 · Takemura. et al. · 2012 [cited by applicant]
US 20120217487A1 · Yamazaki et al. · 2012 [cited by applicant]
US 20120242219A1 · Seo et al. · 2012 [cited by applicant]
US 20120248421A1 · Yamazaki et al. · 2012 [cited by applicant]
US 20120256535A1 · Seo et al. · 2012 [cited by applicant]
US 20120267618A1 · Monkman et al. · 2012 [cited by applicant]
US 20130048964A1 · Takeda et al. · 2013 [cited by applicant]
US 20130069090A1 · Sawabe et al. · 2013 [cited by applicant]
US 20130306945A1 · Seo · 2013 [cited by applicant]
US 20140034926A1 · Matsubara et al. · 2014 [cited by applicant]
US 20150069352A1 · Kim et al. · 2015 [cited by applicant]
US 20170279061A1 · Yamazaki · 2017 [cited by applicant]
US 20190097155A1 · Kim et al. · 2019 [cited by applicant]
CN 001934906A · 2007 [cited by applicant]
CN 102203977A · 2011 [cited by applicant]
CN 102668149A · 2012 [cited by applicant]
EP 1202608A · 2002 [cited by applicant]
EP 1670082A · 2006 [cited by applicant]
EP 1727396A · 2006 [cited by applicant]
EP 2166585A · 2010 [cited by applicant]
EP 2166586A · 2010 [cited by applicant]
EP 2166587A · 2010 [cited by applicant]
EP 2166588A · 2010 [cited by applicant]
EP 2166589A · 2010 [cited by applicant]
EP 2166590A · 2010 [cited by applicant]
EP 2166591A · 2010 [cited by applicant]
EP 2363398A · 2011 [cited by applicant]
EP 2366753A · 2011 [cited by applicant]
JP 2000133453A · 2000 [cited by applicant]
JP 2004047493A · 2004 [cited by applicant]
JP 2004522276 · 2004 [cited by applicant]
JP 2006172763A · 2006 [cited by applicant]
JP 2006203172A · 2006 [cited by applicant]
JP 2007073620A · 2007 [cited by applicant]
JP 2007335214A · 2007 [cited by applicant]
JP 2008524848 · 2008 [cited by applicant]
JP 2008288344A · 2008 [cited by applicant]
JP 2009049223A · 2009 [cited by applicant]
JP 2009094076A · 2009 [cited by applicant]
JP 2010033780A · 2010 [cited by applicant]
JP 2010161357A · 2010 [cited by applicant]
JP 2011201869A · 2011 [cited by applicant]
JP 2011204673A · 2011 [cited by applicant]
JP 2012004526A · 2012 [cited by applicant]
JP 4970934 · 2012 [cited by applicant]
JP 2013509670 · 2013 [cited by applicant]
JP 2013125653A · 2013 [cited by applicant]
JP 6216175 · 2017 [cited by applicant]
JP 6542855 · 2019 [cited by applicant]
JP 6947892 · 2021 [cited by applicant]
JP 2023014229A · 2023 [cited by applicant]
KR 20040075043A · 2004 [cited by applicant]
KR 20040082286A · 2004 [cited by applicant]
KR 20060129478A · 2006 [cited by applicant]
KR 20110099645A · 2011 [cited by applicant]
KR 20120103571A · 2012 [cited by applicant]
KR 20130115027A · 2013 [cited by applicant]
TW 200303154 · 2003 [cited by applicant]
TW 200540252 · 2005 [cited by applicant]
WO WO2000070655 · 2000 [cited by applicant]
WO WO2003059015 · 2003 [cited by applicant]
WO WO2005091684 · 2005 [cited by applicant]
WO WO2006076092 · 2006 [cited by applicant]
WO WO2009008346 · 2009 [cited by applicant]
WO WO2010028262 · 2010 [cited by applicant]
WO WO2011042443 · 2011 [cited by applicant]
WO WO2011055608 · 2011 [cited by applicant]
WO WO2014021443 · 2014 [cited by applicant]
Baldo.M et al., “Highly Efficient Phosphorescent Emission From Organic Electroluminescent Devices”, Nature, Sep. 10, 1998, vol. 395, pp. 151-154. [cited by applicant]
Baldo.M et al., “Very High-Efficiency Green Organic Light-Emitting Devices Based on Electrophosphorescence”, Appl. Phys. Lett. (Applied Physics Letters) , Jul. 5, 1999, vol. 75, No. 1, pp. 4-6. [cited by applicant]
Gu.G et al., “Transparent Organic Light Emitting Devices”, Appl. Phys. Lett. (Applied Physics Letters) , May 6, 1996, vol. 68, No. 19, pp. 2606-2608. [cited by applicant]
Choong.V et al., “Organic Light-Emitting Diodes With a Bipolar Transport Layer”, Appl. Phys. Lett. (Applied Physics Letters) , Jul. 12, 1999, vol. 75, No. 2, pp. 172-174. [cited by applicant]
Adachi.C et al., “Nearly 100% Internal Phosphorescence Efficiency in an Organic Light Emitting Device”, J. Appl. Phys. (Journal of Applied Physics) , Nov. 15, 2001, vol. 90, No. 10, pp. 5048-5051. [cited by applicant]
Baldo.M et al., “Prospects for Electrically Pumped Organic Lasers”, Phys. Rev. B (Physical Review. B), Jul. 19, 2002, vol. 66, pp. 035321-1-035321-16. [cited by applicant]
Markham.J et al., “High-efficiency green phosphorescence from spin-coated single-layer dendrimer light-emitting diodes”, Appl. Phys. Lett. (Applied Physics Letters) , Apr. 15, 2002, vol. 80, No. 15, pp. 2645-2647. [cited by applicant]
Itano.K et al., “Exciplex formation at the organic solid-state interface: Yellow emission in organic light-emitting diodes using green-fluorescent tris(8-quinolinolato)aluminum and hole-transporting molecular materials … [cited by applicant]
Kondakova.M et al., “High-efficiency, low-voltage phosphorescent organic light-emitting diode devices with mixed host”, J. Appl. Phys. (Journal of Applied Physics) , Nov. 4, 2008, vol. 104, pp. 094501-1-094501-17. [cited by applicant]
Seo.J et al., “Efficient blue-green organic light-emitting diodes based on heteroleptic tris-cyclometalated iridium(III) complexes”, Thin Solid Films, Sep. 25, 2008, vol. 517, No. 5, pp. 1807-1810. [cited by applicant]
Fujita.M et al., “Reduction of operating voltage in organic light-emitting diode by corrugated photonic crystal structure”, Appl. Phys. Lett. (Applied Physics Letters) , Dec. 6, 2004, vol. 85, No. 23, pp. 5769-5771. [cited by applicant]
International Search Report (Application No. PCT/JP2013/070951) Dated Oct. 8, 2013. [cited by applicant]
Written Opinion (Application No. PCT/JP2013/070951) Dated Oct. 8, 2013. [cited by applicant]
Yersin.H et al., Highly Efficient OLEDs with Phosphorescent Materials, 2008, pp. 1-97,283-309, Wiley-VCH Verlag Gmbh & Co. [cited by applicant]
Tokito.S et al., “Improvement in performance by doping”, Organic EL Display, Aug. 20, 2004, pp. 67-99, Ohmsha. [cited by applicant]
Jeon.W et al., “Ideal host and guest system in phosphorescent OLEDs”, Organic Electronics, 2009, vol. 10, pp. 240-246, Elsevier. [cited by applicant]
Su.S et al., “RGB Phosphorescent Organic Light-Emitting Diodes by Using Host Materials with Heterocyclic Cores:Effect of Nitrogen Atom Orientations”, Chem. Mater. (Chemistry of Materials), 2011, vol. 23, No. 2, pp. 274-… [cited by applicant]
Rausch.A et al., “Matrix Effects on the Triplet State of the OLED Emitter Ir(4,6-dFppy)2(pic)(Flrpic):Investigations by High-Resolution Optical Spectroscopy”, Inorg. Chem. (Inorganic Chemistry), 2009, vol. 48, No. 5, pp… [cited by applicant]
Gong.X et al., “Phosphorescence from iridium complexes doped into polymer blends”, J. Appl. Phys. (Journal of Applied Physics) , Feb. 1, 2004, vol. 95, No. 3, pp. 948-953. [cited by applicant]
Zhao.Q et al., “Synthesis and Photophysical, Electrochemical, and Electrophosphorescent Properties of a Series of Iridium(III) Complexes Based on Quinoline Derivatives and Different β-Diketonate Ligands”, ORGANOMETALLIC… [cited by applicant]
Hino.Y et al., “Red Phosphorescent Organic Light-Emitting Diodes Using Mixture System of Small-Molecule and Polymer Host”, Jpn. J. Appl. Phys. (Japanese Journal of Applied Physics) , Apr. 21, 2005, vol. 44, No. 4B, pp. … [cited by applicant]
Tsuboyama.A et al., “Homoleptic Cyclometalated Iridium Complexes with Highly Efficient Red Phosphorescence and Application to Organic Light-Emitting Diode”, J. Am. Chem. Soc. (Journal of the American Chemical Society), … [cited by applicant]
Chen.F et al., “Triplet Exciton Confinement in Phosphorescent Polymer Light-Emitting Diodes”, Appl. Phys. Lett. (Applied Physics Letters) , Feb. 17, 2003, vol. 82, No. 7, pp. 1006-1008. [cited by applicant]
Lee.J et al., “Stabilizing the efficiency of phosphorescent organic light-emitting diodes”, SPIE Newsroom, Apr. 21, 2008, pp. 1-3. [cited by applicant]
Tokito.S et al., “Confinement of Triplet Energy on Phosphorescent Molecules for Highly-Efficient Organic Blue-Light-Emitting Devices”, Appl. Phys. Lett. (Applied Physics Letters) , Jul. 21, 2003, vol. 83, No. 3, pp. 569… [cited by applicant]
Endo.A et al., “Efficient Up-Conversion of Triplet Excitons Into a Singlet State and Its Application for Organic Light Emitting Diodes”, Appl. Phys. Lett. (Applied Physics Letters) , Feb. 24, 2011, vol. 98, No. 8, pp. 0… [cited by applicant]
Park.Y et al., “Efficient triplet harvesting by fluorescent molecules through exciplexes for high efficiency organic light-emitting diodes”, Appl. Phys. Lett. (Applied Physics Letters) , Apr. 18, 2013, vol. 102, No. 15,… [cited by applicant]
Suzuki.K et al., “Photophysical study of iridium complexes by absolute photoluminescence quantum yield measurements using an integrating sphere”, Proceedings of SPIE, 2009, vol. 7415, pp. 741504-1-741504-8. [cited by applicant]
Lamansky.S et al., “Highly Phosphorescent Bis-Cyclometalated Iridium Complexes: Synthesis, Photophysical Characterization, and Use in Organic Light Emitting Diodes”, J. Am. Chem. Soc. (Journal of the American Chemical S… [cited by applicant]
Swensen.J et al., “Improved Efficiency in Blue Phosphorescent Organic Light-Emitting Devices Using Host Materials of Lower Triplet Energy than the Phosphorescent Blue Emitter”, Adv. Funct. Mater. (Advanced Functional Ma… [cited by applicant]