Lighting device having a photoconversion layer

Patent metadata

Field	Value
Publication number	US-10538699-B2
Application number	US-201715456661-A
Country	US
Kind code	B2
Filing date	Mar 13, 2017
Priority date	Jun 9, 2016
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

A lighting device includes a light source and a photoconversion layer including a perovskite compound represented by Formula 1. The perovskite compound absorbs at least part of light emitted from the light source and emits light having a different wavelength range from the absorbed light:

[A][B][X] 3   <Formula 1>

In Formula 1, A is at least one monovalent organic cation, at least one a monovalent inorganic cation, or any combination thereof, B is at least one divalent inorganic cation, and X is at least one monovalent anion.

First claim

What is claimed is:

1. A lighting device comprising:
a light source; and
a photoconversion layer comprising a perovskite compound represented by Formula 1, the perovskite compound absorbing at least part of light emitted from the light source and emitting light having a different wavelength range from a wavelength range of the absorbed light:
[A][B][X]3  <Formula 1>

wherein, in Formula 1,
A is at least one monovalent organic cation, at least one a monovalent inorganic cation, or any combination thereof,
B is at least one divalent inorganic cation, wherein B includes at least one divalent inorganic cation selected from La2+, Ce2+, Pr2+, Nd2+, Pm2+, Eu2+, Gd2+, Tb2+, Ho2+, Er2+, Tm2+, Yb2+, Lu2+, Be2+, Mg2+, Ca2+, Sr2+, Ba2+, Ra2+, and
X is at least one monovalent anion.

2. The lighting device of claim 1 , wherein A is (R1R2R3C)+, (R1R2R3R4N)+, (R1R2R3R4P)+, (R1R2R3R4As)+, (R1R2R3R4Sb)+, (R1R2N═C(R3)—NR4R6)+, a substituted or unsubstituted cycloheptatrienium, a substituted or unsubstituted nitrogen-containing 5-membered cyclic monovalent cation, a substituted or unsubstituted nitrogen-containing 6-membered cyclic monovalent cation, Li+, Na+, K+, Rb+, Cs+, Fr+, or any combination thereof,
R1 to R5 are each independently selected from a hydrogen, a deuterium (-D), —F, —Cl, —Br, —I, a hydroxyl group, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C6-C60 aryl group, or —N(Q1)(Q2),
at least one substituent of the substituted cycloheptatrienium, the substituted nitrogen-containing 5 -membered cyclic monovalent cation, and the substituted nitrogen-containing 6-membered cyclic monovalent cation is selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C6-C60 aryl group, or —N(Q3)(Q4), and
Q1 to Q4 are each independently selected from a hydrogen, a deuterium, a hydroxyl group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, or a C6-C60 aryl group.

3. The lighting device of claim 1 , wherein A is (R1R2R3R4N)+, K+, Rb+, Cs+, or any combination thereof,
R1 to R4 are each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a C1-C20 alkyl group, a C1-C20 alkoxy group, or —N(Q1)(Q2), and
Q1 and Q2 are each independently selected from a hydrogen, a deuterium, a hydroxyl group, a C1-C20 alkyl group, or a C1-C20 alkoxy group.

4. The lighting device of claim 1 , wherein A is (NH4)+, (PH4)+, (AsH4)+, (SbH4)+, (NF4)+, (PF4)+, (NCl4)+, (PCl4)+, (CH3NH3)+, (CH3PH3)+, (CH3AsH3)+, (CH3SbH3)+, ((CH3)2NH2)+, ((CH3)2PH2)+, ((CH3)2AsH2)+, ((CH3)2SbH2)+, ((CH3)3NH)+, ((CH3)3PH)+, ((CH3)3AsH)+, ((CH3)3SbH)+, ((CH3CH2)NH3)+, ((CH3CH2)PH3)+, ((CH3CH2)AsH3)+, ((CH3CH2)SbH3)+, (CH2N2H4)+, (C7H7)+, (NH3OH)+, (NH3NH2)+, ((CH2)3NH2)+, (CH(NH2)2)+, (C3N2H5)+, (NC4H8)+, ((NH2)3C)+, K+, Rb+, Cs+, or any combination thereof.

5. The lighting device of claim 1 , wherein B further includes Pb2+.

6. The lighting device of claim 1 , wherein B comprises:
Tm+2; and
La2+, Ce2+, Pr2+, Nd2+, Pm2+, Eu2+, Gd2+, Tb2+, Ho2+, Er2+, Yb2+, Lu2+, Be2+, Mg2+, Ca2+, Sr2+, Ba2+, Ra2+, Pb2+, Sn2+, or any combination thereof.

7. The lighting device of claim 1 , wherein X is at least one halide anion.

8. The lighting device of claim 1 , wherein X is an iodide ion (I—).

9. The lighting device of claim 1 , wherein the light source is a fluorescent lamp, a light-emitting diode (LED), an organic light-emitting diode (OLED), a quantum dot light-emitting diode (QLED), or any combination thereof.

10. The lighting device of claim 1 , wherein the light source emits blue light or ultraviolet (UV) light.

11. The lighting device of claim 1 , wherein the light source emits blue light, and
the photoconversion layer comprises a perovskite compound that absorbs the blue light and emits yellow light.

12. The lighting device of claim 1 , wherein the light source emits blue light, and
the photoconversion layer comprises:
a first perovskite compound that absorbs the blue light and emits green light; and
a second perovskite compound that absorbs the blue light and/or green light and emits red light.

13. The lighting device of claim 1 , wherein the light source emits blue light, and
the photoconversion layer comprises:
a first layer comprising a first perovskite compound that absorbs the blue light and emits green light; and
a second layer comprising a second perovskite compound that absorbs the blue light and/or green light and emits red light.

14. The lighting device of claim 1 , wherein the light source emits UV light, and
the photoconversion layer comprises:
a first perovskite compound that absorbs the UV light and emits blue light;
a second perovskite compound that absorbs the UV light and/or blue light and emits green light; and
a third perovskite compound that absorbs the UV light, blue light, and/or green light, and emits red light.

15. The lighting device of claim 1 , wherein the light source emits UV light, and
the photoconversion layer comprises:
a first layer comprising a first perovskite compound that absorbs the UV light and emits blue light and second perovskite compound that absorbs the UV light and/or blue light and emits green light; and a second layer comprising a third perovskite compound that absorbs the UV light, blue light, and/or green light, and emits red light, or
a first layer comprising a first perovskite compound that absorbs the UV light and emits blue light; and a second layer comprising a second perovskite compound that absorbs the UV light and/or blue light and emits green light, and a third perovskite compound that absorbs the UV light, blue light, and/or green light, and emits red light.

16. The lighting device of claim 1 , wherein the light source emits UV light, and
the photoconversion layer comprises:
a first layer comprising a first perovskite compound that absorbs the light and emits blue light;
a second layer comprising a second perovskite compound that absorbs the UV light and/or blue light and emits green light; and
a third layer comprising a third perovskite compound that absorbs the UV light, blue light, and/or green light, and emits red light.

17. The lighting device of claim 1 , wherein the photoconversion layer is in direct contact with at least one surface of the light source; or
the light source and the photoconversion layer are separated from one another.

18. The lighting device of claim 1 , further comprising a light guide plate, a diffuser plate, a prism sheet, a microlens sheet, a luminance enhancement sheet, a reflective film, or any combination thereof between the light source and the photoconversion layer.

19. The lighting device of claim 1 , further comprising a light guide plate, a diffuser plate, a prism sheet, a rnicrolens sheet, a luminance enhancement sheet, a reflective film, or any combination thereof above the photoconversion layer.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Dongchan
• Kim Yisu
• Lee Byoungduk
• Cho Yoonhyeung
• Ju Yongchan

Classifications

• C09K11/779 Primary

  Halogenides (C09K11/7784 takes precedence) · CPC title

• F21V13/14

  the elements being filters or photoluminescent elements, reflectors and refractors · CPC title

• F21V9/06

  for filtering out ultraviolet radiation · CPC title

• F21V9/30

  Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40) · CPC title

• C03C17/3405

  with at least two coatings of organic materials (C03C17/36, C03C17/42 take precedence) · CPC title