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A white LED lamp bead with ultraviolet excitation perovskite phosphor

A technology of LED lamp beads and perovskite, which is applied in the direction of semiconductor devices, electrical components, circuits, etc., can solve the problems that the heat dissipation effect of lamp beads cannot be well solved, the LED luminous intensity is reduced, and the life of LED lamp beads is affected. Achieve the effects of reducing the difficulty of packaging operations and product defect rate, good light decay consistency, and low production cost

Active Publication Date: 2019-07-19
苏州轻光材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The luminescence of LED lamp beads is greatly affected by temperature. As the temperature rises, the luminous intensity of LEDs will decrease, and it will also have a great impact on the life of LED lamp beads.
Especially in terms of high-power (referring to more than 1W) LED lamp beads, the heat dissipation effect of lamp beads has not been well resolved; at the same time, the stability of existing LED lamp beads is low

Method used

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  • A white LED lamp bead with ultraviolet excitation perovskite phosphor
  • A white LED lamp bead with ultraviolet excitation perovskite phosphor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A white LED lamp bead for ultraviolet excitation of perovskite phosphors, the general chemical formula of the white phosphors is R 2 A （n-1） B n X （3n+1） , Where R is a large radius cation, which is Ca 2+ , Sr 2+ , Ba 2+ One or more of, A is a small radius cation, Ti 4+ , Zr 4+ One or more of, B is divalent cation, Pb 2+ , Ge 2+ , Sn 2+ , Cu 2+ , Cr 2+ , Cd 2+ , Eu 2+ Or Yb 2+ X is a halogen, one of F, Cl, and Br, and n is an integer ≥1.

[0025] When n is 1, the perovskite structure is a pure two-dimensional layered perovskite; when n is infinite, the perovskite structure is a three-dimensional perovskite; when n is greater than 1 integer, the perovskite structure The ore structure is a quasi-two-dimensional layered perovskite.

[0026] The white phosphor can emit white light under the excitation of ultraviolet light with a wavelength of 350 nm, and the excitation wavelength is relatively short, and the excitation spectrum range is wide.

[0027] The method for preparing whi...

Embodiment 2

[0035] A white LED lamp bead for ultraviolet excitation of perovskite phosphor, the white phosphor in the step (1) has a general chemical formula of R 2 A （n-1） B n X （3n+1） , Where R is a large radius cation, which is Ca 2+ , Sr 2+ , Ba 2+ One or more of, A is a small radius cation, Ti 4+ , Zr 4+ One or more of, B is divalent cation, Pb 2+ , Ge 2+ , Sn 2+ , Cu 2+ , Cr 2+ , Cd 2+ , Eu 2+ Or Yb 2+ X is a halogen, one of F, Cl, and Br, and n is an integer ≥1.

[0036] When n is 1, the perovskite structure is a pure two-dimensional layered perovskite; when n is infinite, the perovskite structure is a three-dimensional perovskite; when n is greater than 1 integer, the perovskite structure The ore structure is a quasi-two-dimensional layered perovskite.

[0037] The white phosphor can emit white light under the excitation of ultraviolet light with a wavelength of 405 nm, the excitation wavelength thereof is relatively short, and the excitation spectrum range is wide.

[0038] The method ...

Embodiment 3

[0046] A white LED lamp bead for ultraviolet excitation of perovskite phosphor, the white phosphor in the step (1) has a general chemical formula of R 2 A （n-1） B n X （3n+1） , Where R is a large radius cation, which is Ca 2+ , Sr 2+ , Ba 2+ One or more of, A is a small radius cation, Ti 4+ , Zr 4+ One or more of, B is divalent cation, Pb 2+ , Ge 2+ , Sn 2+ , Cu 2+ , Cr 2+ , Cd 2+ , Eu 2+ Or Yb 2+ X is a halogen, one of F, Cl, and Br, and n is an integer ≥1.

[0047] When n is 1, the perovskite structure is a pure two-dimensional layered perovskite; when n is infinite, the perovskite structure is a three-dimensional perovskite; when n is greater than 1 integer, the perovskite structure The ore structure is a quasi-two-dimensional layered perovskite.

[0048] The white phosphor can emit white light when excited by ultraviolet light with a wavelength of 365 nm, the excitation wavelength is relatively short, and the excitation spectrum range is wide.

[0049] The method for preparing wh...

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Abstract

The invention discloses an ultraviolet-excited white light LED lamp bead of perovskite fluorescent powder. The internal structure is compact, the stability is good, light of the bottom can be reflected to a packaging lens by a high-temperature-resistant reflector plate, and the illumination intensity is improved. The heat is radiated by a mode of combined radiation of an outer heat conductive coat, a heat conducting sheet, inner heat conductive silica gel, a bottom copper foil and an aluminium substrate, so the heat dispersion is guaranteed. A base is installed and convenient for rapid replacing. The fluorescent powder is uniformly coated on the inner wall of the packaging lens, and the fluorescent powder is a perovskite structure. The fluorescent powder is the single-phase fluorescent powder which can be excited for emitting the white light by the ultraviolet light with the shorter wavelength, and the light intensity of the fluorescent powder is high. The problems of the defect and the low light effect caused by the mixed fluorescent powder are overcome. The preparation method is simple, the production cost is low, and the energy consumption is less. The white fluorescent powder has the stable chemical property, better humidity resistance and better light failure consistency. The perovskite has the characteristics of high luminous efficiency and higher photochromic adjustability.

Description

Technical field [0001] The invention relates to the technical field of white-light LED lamp beads, in particular to a white-light LED lamp bead with ultraviolet excitation perovskite phosphor. Background technique [0002] Compared with the traditional light source, the visible light emitted by the LED light-emitting diode has the advantages of energy saving, high luminous flux, long life, and the average life span can reach 100,000 hours. It is pollution-free. There is no ultraviolet light in the emitted light. With the in-depth research on the tube as a visible light source, the use of LED lamps to replace traditional incandescent lamps and energy-saving fluorescent lamps has become a technology that countries are working hard to develop. [0003] Compared with traditional lighting fixtures, LEDs and other fixtures do not need to use filters or filters to produce colored light, not only have high efficiency, pure light color, but also can achieve dynamic or gradual color changes,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/48H01L33/50H01L33/60H01L33/62H01L33/64
CPCH01L33/48H01L33/502H01L33/60H01L33/62H01L33/64
Inventor 马必鹉董安钢张家奇夏浩孚陈延兵
Owner 苏州轻光材料科技有限公司
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