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Ultraviolet-excited white light LED lamp bead of perovskite fluorescent powder

A technology of LED lamp beads and perovskite, which is applied in electrical components, circuits, semiconductor devices, etc., can solve the problems such as the inability to solve the heat dissipation effect of the lamp beads, the reduction of the luminous intensity of the LED, and the influence of the life of the LED lamp beads, etc. Achieve the effect of reducing the difficulty of packaging operations and product defect rate, good light decay consistency, and low production costs

Active Publication Date: 2017-12-05
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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  • Ultraviolet-excited white light LED lamp bead of perovskite fluorescent powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A white light LED lamp bead that excites perovskite phosphor powder by ultraviolet rays, and the chemical general formula of the white phosphor powder is R 2 A （n-1） B n x （3n+1） , where R is a large-radius cation, 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 a divalent cation, is Pb 2+ 、 Ge 2+ , Sn 2+ 、Cu 2+ 、Cr 2+ 、Cd 2+ 、Eu 2+ or Yb 2+ One of, X is a halogen, one of F, Cl, Br, n is an integer ≥ 1.

[0025] In the white phosphor, 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 an integer, the perovskite The ore structure is quasi-two-dimensional layered perovskite.

[0026] The white fluorescent powder can emit white light under the excitation of ultraviolet light with a wavelength of 350nm, the excitation wavelength is relatively short, and the excitation spectr...

Embodiment 2

[0035] A white LED lamp bead that excites perovskite phosphor powder by ultraviolet light, the white phosphor powder 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, 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 a divalent cation, is Pb 2+ 、 Ge 2+ , Sn 2+ 、Cu 2+ 、Cr 2+ 、Cd 2+ 、Eu 2+ or Yb 2+ One of, X is a halogen, one of F, Cl, Br, n is an integer ≥ 1.

[0036] In the white phosphor, 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 an integer, the perovskite The ore structure is quasi-two-dimensional layered perovskite.

[0037] The white fluorescent powder can emit white light under the excitation of ultraviolet light with a wavelength of 405nm, the excitation wavelength is relatively short, and the excitation ...

Embodiment 3

[0046] A white LED lamp bead that excites perovskite phosphor powder by ultraviolet light, the white phosphor powder 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, 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 a divalent cation, is Pb 2+ 、 Ge 2+ , Sn 2+ 、Cu 2+ 、Cr 2+ 、Cd 2+ 、Eu 2+ or Yb 2+ One of, X is a halogen, one of F, Cl, Br, n is an integer ≥ 1.

[0047] In the white phosphor, 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 an integer, the perovskite The ore structure is quasi-two-dimensional layered perovskite.

[0048] The white fluorescent powder can emit white light under the excitation of ultraviolet light with a wavelength of 365nm, the excitation wavelength is relatively short, and the excitation ...

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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-excited perovskite phosphor powder. Background technique [0002] Compared with traditional light sources, the visible light emitted by LED light-emitting diodes has power saving, high luminous flux, and long life. The average life can reach 100,000 hours. Despite the in-depth research on visible light sources, replacing traditional incandescent lamps and energy-saving fluorescent lamps with LED lamps has become a technology that countries are working hard to develop. [0003] Compared with traditional lighting fixtures, LEDs and other lighting fixtures do not need to use filters or filters to produce colored light, which not only has high efficiency and pure light color, but also can realize dynamic or gradual color changes, and is widely used. LED lamp beads are one of the three major components of LED lamps and o...

Claims

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Application Information

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Patent Type & Authority Applications(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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