Light-emitting device, light-emitting apparatus, electronic device, and lighting device
To provide a light-emitting device not only including a light-emitting layer in which energy is efficiently transferred from a host material to a guest material but also having high reliability. In the light-emitting device, the light-emitting layer includes an organic compound having a specific naphthofuropyrazine skeleton as a host material and a light-emitting substance (e.g., an organometallic complex) whose T1 level (T G ) is within a certain range as a guest material, thereby increasing not only the efficiency of energy transfer from the host material to the guest material but also the reliability.
1. A light-emitting device comprising:
an EL layer between a pair of electrodes,
wherein the EL layer comprises a light-emitting layer,
wherein the light-emitting layer comprises an organic compound comprising a naphtho[2′,1′:4,5]furo[2,3-b]pyrazine skeleton and a phosphorescent substance,
wherein a T1 level of the phosphorescent substance (T G ) is lower than or equal to 2.5 eV, and
wherein the T G is a T1 level derived from an absorption edge of an absorption spectrum of the phosphorescent substance.
2. The light-emitting device according to claim 1 ,
wherein a difference between a T1 level of the organic compound (T H ) and the T1 level of the phosphorescent substance (T G ) satisfies Expression (1), and
0.1 eV≤ T H −T G ≤0.4 eV (1)
wherein the T H is a T1 level derived from an emission edge on a short wavelength side of a phosphorescence spectrum of the organic compound.
3. The light-emitting device according to claim 1 ,
wherein a difference between a T1 level of the organic compound (T H ) and the T1 level of the phosphorescent substance (T G ) satisfies Expression (2), and
0.2 eV≤ T H −T G ≤0.4 eV (2)
wherein the T H is a T1 level derived from an emission edge on a short wavelength side of a phosphorescence spectrum of the organic compound.
4. A light-emitting apparatus comprising:
the light-emitting device according to claim 1 ; and
an FPC.
5. An electronic device comprising:
the light-emitting apparatus according to claim 4 ; and
at least one of a microphone, a camera, an operation button, an external connection portion, and a speaker.
6. A lighting device comprising:
the light-emitting device according to claim 1 ; and
at least one of a housing and a cover.
7. A light-emitting device comprising:
an EL layer between a pair of electrodes,
wherein the EL layer comprises a light-emitting layer, and
wherein the light-emitting layer comprises:
an organic compound comprising a naphtho[2′,1′:4,5]furo[2,3-b]pyrazine skeleton; and
an organometallic complex comprising a diazine skeleton.
8. The light-emitting device according to claim 7 ,
wherein the diazine skeleton is a pyrazine skeleton or a pyrimidine skeleton.
9. The light-emitting device according to claim 7 ,
wherein a difference between a T1 level of the organic compound (T H ) and a T1 level of the organometallic complex (T G ) satisfies Expression (1),
0.1 eV≤ T H −T G ≤0.4 eV (1)
wherein the T G is a T1 level derived from an absorption edge of an absorption spectrum of the organometallic complex, and
wherein the T H is a T1 level derived from an emission edge on a short wavelength side of a phosphorescence spectrum of the organic compound.
10. The light-emitting device according to claim 7 ,
wherein a difference between a T1 level of the organic compound (T H ) and a T1 level of the organometallic complex (T G ) satisfies Expression (2),
0.2 eV≤ T H −T G ≤0.4 eV (2)
wherein the T G is a T1 level derived from an absorption edge of an absorption spectrum of the organometallic complex, and
wherein the T H a T1 level derived from an emission edge on a short wavelength side of a phosphorescence spectrum of the organic compound.
11. A light-emitting apparatus comprising:
the light-emitting device according to claim 7 ; and
an FPC.
12. An electronic device comprising:
the light-emitting apparatus according to claim 11 ; and
at least one of a microphone, a camera, an operation button, an external connection portion, and a speaker.
13. A lighting device comprising:
the light-emitting device according to claim 7 ; and
at least one of a housing and a cover.
14. A light-emitting device comprising:
an EL layer between a pair of electrodes,
wherein the EL layer comprises a light-emitting layer,
wherein the light-emitting layer comprises an organic compound represented by a general formula (G1) and a phosphorescent substance,
wherein a T1 level of the phosphorescent substance (T G ) is lower than or equal to 2.5 eV,
wherein the T G is a T1 level derived from an absorption edge of an absorption spectrum of the phosphorescent substance, and
wherein:
Q represents oxygen or sulfur;
A represents a group with a molecular weight lower than or equal to 1000; and
R 1 to R 6 independently represent any one of hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 7 carbon atoms, and a substituted or unsubstituted aryl group having 6 to 30 carbon atoms.
15. The light-emitting device according to claim 14 ,
wherein a difference between a T1 level of the organic compound (T H ) and the T1 level of the phosphorescent substance (T G ) satisfies Expression (1), and
0.1 eV≤ T H −T G ≤0.4 eV (1)
wherein the T H is a T1 level derived from an emission edge on a short wavelength side of a phosphorescence spectrum of the organic compound.
16. The light-emitting device according to claim 14 ,
wherein a difference between a T1 level of the organic compound (T H ) and the T1 level of the phosphorescent substance (T G ) satisfies Expression (2), and
0.2 eV≤ T H −T G ≤0.4 eV (2)
wherein the T H is a T1 level derived from an emission edge on a short wavelength side of a phosphorescence spectrum of the organic compound.
17. A light-emitting apparatus comprising:
the light-emitting device according to claim 14 ; and
an FPC.
18. An electronic device comprising:
the light-emitting apparatus according to claim 17 ; and
at least one of a microphone, a camera, an operation button, an external connection portion, and a speaker.
19. A lighting device comprising:
the light-emitting device according to claim 14 ; and
at least one of a housing and a cover.