Coated nano particle and electronic device using the same
View Patent ↗A coated nano particle and an electronic device using the composite nano particle as an illuminator are provided. The composite nano particle includes a nano particle receiving light and emitting light; and a coating material formed on a surface of the nano particle and having an index of refraction different from that of the nano particle. The coated nano particle is made by coating a surface of the nano particle with a material having an index of refraction, which has an intermediate value between an index of refraction of a matrix and an index of refraction of the nano particle as an illuminator, with a predetermined thickness. The light emitted from the nano particle is efficiently transferred to the outside as the light reflected from the matrix and absorbed by the nano particle is suppressed. Therefore, a luminous efficiency of the illuminator is improved, and an electronic device using the illuminator is provided.
1. A matrix dispersed coated nanoparticle, comprising:
a nanoparticle, which receives and emits light;
a coating material formed on a surface of the nanoparticle, the coating material having an index of refraction which is less than an index of refraction of the nanoparticle; and
a matrix disposed on the coating material,
wherein the index of refraction of the coating material is greater than an index of refraction of the matrix.
2. The matrix dispersed coated nanoparticle of claim 1 , wherein the coating material is formed on a surface of the nanoparticle with a multi-layered structure, and an index of refraction of a first layer of the multi-layered structure is greater than an index of refraction of a second layer thereof.
3. The coated nanoparticle of claim 2 , wherein the first layer is an inner layer the second layer is an outer layer.
4. The coated nanoparticle of claim 1 , wherein an index of refraction of the coating material is lower than an index of refraction of the nanoparticle.
5. The matrix dispersed coated nanoparticle of claim 1 , wherein the nanoparticle is selected from a group II-VI compound, a group III-V compound, a group IV-VI compound, a group IV compound, or a mixture thereof.
6. The matrix dispersed coated nanoparticle of claim 5 , wherein the group II-VI compound is selected from the group consisting of a two-element compound comprising CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, or HgTe; a three-element compound comprising CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnTe, or HgZnSe; and a four-element compound comprising CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, or HgZnSTe;
the group III-V compound is selected from the group consisting of a two-element compound comprising GaN, Gap, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, or InSb; a three-element compound comprising GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, or GaAlNP; and a four-element compound comprising GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, or InAlPSb;
the group IV-VI compound is selected from the group consisting of a two-element compound comprising SnS, SnSe, SnTe, PbS, PbSe, or PbTe; a three-element compound comprising SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, or SnPbTe; and a four-element compound comprising SnPbSSe, SnPbSeTe, or SnPbSTe; and
the group IV compound is selected from the group consisting of a single element compound comprising Si or Ge; and a two-element compound comprising SiC or SiGe.
7. The matrix dispersed coated nanoparticle of claim 6 , wherein the two-element compound, the three-element compound, or the four-element compound exist inside the nanoparticle.
8. The matrix dispersed coated nanoparticle of claim 1 , wherein the nanoparticle further comprises an inorganic fluorescent material.
9. The matrix dispersed coated nanoparticle of claim 8 , wherein the inorganic fluorescent material is composed of at least one selected from the group consisting of YBO 3 :Ce 3+ , Tb 3+ ; BaMgAl 10 O 17 :Eu 2+ , Mn 2+ ; (Sr, Ca,Ba)(Al,Ga) 2 S 4 :Eu 2+ ; ZnS:Cu,Al; Ca 8 Mg(SiO 4 ) 4 Cl 2 :Eu 2+ , Mn 2+ ; Ba 2 SiO 4 :Eu 2+ ; (Ba,Sr) 2 SiO 4 :Eu 2+ ; Ba 2 (Mg,Zn)Si 2 O 7 :Eu 2+ ; (Ba,Sr)Al 2 O 4 :Eu 2+ ; Sr 2 Si 3 O 8.2 SrCl 2 :Eu 2+ ; (Sr,Mg,Ca) 10 (PO 4 ) 6 Cl 2 :Eu 2+ ; BaMgAl 10 O 17 :Eu 2+ ; BaMg 2 Al 16 O 27 :Eu 2+ ; (Sr, Ca,Ba,Mg)P 2 O 7 :Eu 2+ , Mn 2 +; CaLa 2 S 4 :Ce 3+ ; SrY 2 S 4 :Eu 2+ ; (Ca,Sr)S:Eu 2+ ; SrS:Eu 2+ ; Y 2 O 3 :Eu 3+ , Bi 3+ ; YVO 4 :Eu 3+ , Bi 3+ ;Y 2 O 2 S:Eu 3+ , Bi 3+ ; and Y 2 O 2 S:Eu 3+ .
10. The matrix dispersed coated nanoparticle of claim 1 , wherein the coating material is selected from the group consisting of SiO 2 , TiO 2 , SnO 2 , ZnO, ZnS, an In 2 O 3 —SnO 2 composite, and Al 2 O 3 , and a mixture thereof.
11. The matrix dispersed coated nanoparticle of claim 1 , wherein light allowing the nanoparticle to emit has a wavelength of approximately 400 to 2400 nm.
12. An electronic device comprising a matrix dispersed coated nanoparticle as an illuminator, the matrix dispersed coated nanoparticle comprising:
a nanoparticle, which receives and emits light;
a coating material formed on a surface of the nanoparticle, the coating material having an index of refraction which is less than an index of refraction of the nanoparticle; and
a matrix disposed on the coating material,
wherein the index of refraction of the coating material is greater than an index of refraction of the matrix.
13. The electronic device of claim 12 , wherein the coating material is formed on a surface of the nanoparticle with a multi-layered structure, and an index of refraction of a lower portion in the multi-layered structure is greater than an index of refraction of an upper portion thereof.
14. The electronic device of claim 12 , wherein a difference of indexes of refraction between the coating material and the nanoparticle is 0.05 or more.
15. The electronic device of claim 12 , wherein the nanoparticle is selected from a group II-VI compound, a group III-V compound, a group IV-VI compound, a group IV compound, or a mixture thereof.
16. The electronic device of claim 15 , wherein the group II-VI compound is selected from the group consisting of a two-element compound comprising CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, or HgTe; a three-element compound comprising CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnTe, or HgZnSe; and a four-element compound such as CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, or HgZnSTe;
the group III-V compound is selected from the group consisting of a two-element compound comprising GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, or InSb; a three-element compound comprising GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, or GaAlNP; and a four-element compound comprising GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, or InAlPSb;
the group IV-VI compound is selected from the group consisting of a two-element compound comprising SnS, SnSe, SnTe, PbS, PbSe, or PbTe; a three-element compound comprising SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, or SnPbTe; and a four-element compound comprising SnPbSSe, SnPbSeTe, or SnPbSTe; and
the group IV compound is selected from the group consisting of a single element compound comprising Si or Ge; and a two-element compound comprising SiC or SiGe.
17. The electronic device of claim 16 , wherein the two-element compound, the three-element compound, or the four-element compound exist inside a particle with a constant concentration, or exist inside a same particle with divided into different states in concentration.
18. The electronic device of claim 12 , wherein the nanoparticle is selected from the group consisting of inorganic fluorescent materials or a mixture thereof.
19. The electronic device of claim 18 , wherein the inorganic fluorescent material is composed of at least one selected from the group consisting of YBO 3 :Ce 3+ , Tb 3+ ; BaMgAl 10 O 17 :Eu 2+ , Mn 2+ ; (Sr, Ca,Ba)(Al,Ga) 2 S 4 :Eu 2+ ; ZnS:Cu,Al; Ca 8 Mg(SiO 4 ) 4 Cl 2 :Eu 2+ ,Mn 2+ ; Ba 2 SiO 4 :Eu 2+ ; (Ba,Sr) 2 SiO 4 :Eu 2+ ; Ba 2 (Mg,Zn)Si 2 O 7 :Eu 2+ ; (Ba,Sr)Al 2 O 4 :Eu 2+ ; Sr 2 Si 3 O 8.2 SrCl 2 :Eu 2+ ; (Sr,Mg,Ca) 10 (PO 4 ) 6 Cl 2 :Eu 2+ ; BaMgAl 10 O 17 :Eu 2+ ; BaMg 2 Al 16 O 27 :Eu 2+ ; Sr, Ca,Ba,Mg)P 2 O 7 :Eu 2+ , Mn 2+ ; CaLa 2 S 4 :Ce 3+ ; SrY 2 S 4 :Eu 2+ ; (Ca,Sr)S:Eu 2+ ; SrS:Eu 2+ ; Y 2 O 3 :Eu 3+ , Bi 3+ ; YVO 4 :Eu 3+ , Bi 3+ ;Y 2 O 2 S:Eu 3+ , Bi 3+ ; and Y 2 O 2 S:Eu 3+ .
20. The electronic device of claim 12 , wherein the coating material is selected from the group consisting of SiO 2 , TiO 2 , SnO 2 , ZnO, ZnS, In 2 O 3 —SnO 2 , and Al 2 O 3 , or a mixture thereof.
21. The electronic device of claim 12 , wherein the electronic device is one among a light emitting diode, a laser diode, an LCD, or a PDP.
22. The electronic device of claim 12 , wherein the electronic device further comprises:
a light source emitting light on to the matrix.
23. The electronic device of claim 22 , wherein the light source emits light having a wavelength of approximately 400 to 2400 nm.
24. The electronic device of claim 22 , wherein a difference of indexes of refraction between the matrix and the coating material of the composite nanoparticle is 0.05 or more.
25. The electronic device of claim 22 , wherein the matrix is selected from the group consisting of epoxy, silicon, acrylate polymer, glass, carbonate polymer, and a mixture thereof.
26. A matrix dispersed coated nanoparticle comprising:
a nanoparticle;
a coating material formed on a surface of the nanoparticle, the coating material enclosing the nanoparticle to form a coated nanoparticle; and
a matrix, the matrix enclosing the coated nanoparticle,
wherein a difference of an index of refraction of the coating material and an index of refraction of the nanoparticle is 0.05 to 2, and a difference of the index of refraction of the coating material and an index of refraction of the matrix is equal to or greater than 0.05, and wherein the index of refraction of the coating material is greater than an index of refraction of the matrix.