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Perovskite white fluorescent powder for ultraviolet excited white-light LED and preparation method thereof

A phosphor and perovskite technology, applied in the field of white light phosphors, can solve the problems of wide excitation spectral range, short excitation light wavelength, increased energy loss, etc., and achieve good light decay consistency, chemical stability, and low production costs. Effect

Inactive Publication Date: 2018-02-16
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

[0005] Using ultraviolet LED as the excitation source with red and blue phosphors to prepare white LEDs, due to the radiation reabsorption between phosphors of different substrates, it will increase energy loss and reduce luminous efficiency, so single-phase phosphors excited by ultraviolet LEDs have become the mainstream development. Trend; There are many reported UV LEDs to excite single-phase phosphors, such as the Chinese invention patent of application number CN106929011A, which provides a perovskite white phosphor and preparation method for UV-excited white LEDs, and its general chemical formula is M 1-x-y-z SM x Tb y T m z AlSiN 3-2(x+y+z) / 2 , wherein: M is at least one of Ca, Sr, and Ba, 0.001≤x≤0.2, 0.001≤y≤0.1, 0.001≤z≤0.2, and the white light phosphor can emit White light with short excitation wavelength and wide excitation spectrum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A perovskite white fluorescent powder for ultraviolet excitation white light LED, its general chemical formula 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 spectrum range is wide.

[0027] Preferably, ...

Embodiment 2

[0039] A perovskite white fluorescent powder for ultraviolet excitation white light LED, its general chemical formula 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.

[0040] 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.

[0041] 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 spectrum range is wide.

[0042] The preparat...

Embodiment 3

[0054] A perovskite white fluorescent powder for ultraviolet excitation white light LED, its general chemical formula 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.

[0055] 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.

[0056] 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 spectrum range is wide.

[0057] Preferably, ...

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Abstract

The invention discloses perovskite white fluorescent powder for an ultraviolet excited white-light LED and a preparation method thereof. The perovskite white fluorescent powder provided by the invention comprises a perovskite structure, has high light-emitting efficiency and high light-color adjustability, and is single-phase fluorescent powder capable of emitting white light under excitation of ultraviolet light with short wavelength; meanwhile, the light-emitting intensity of the fluorescent powder is high; the disadvantages caused by mixing preparation of the fluorescent powder and the problem of low luminous efficacy are overcome; the preparation method has the advantages of simplicity, low production cost and low energy consumption; and the white fluorescent powder provided by the invention has stable chemical properties, good moisture resistance and good luminous decay consistency.

Description

technical field [0001] The invention relates to the technical field of white light phosphors, in particular to perovskite white phosphors for ultraviolet excitation white light LEDs and a preparation method. Background technique [0002] In recent years, with the gradual reduction of luminous efficiency and cost of light-emitting diodes, semiconductor lighting has gradually become the development trend of modern lighting. For "21st Century Green Light Source". [0003] At present, the main methods for obtaining white light from GaN-based LEDs are: blue LED + yellow phosphor powder, three-color LED synthetic white light, and purple LED + three-color phosphor powder. Commercially available white LEDs use GaN-based LED chips emitting 450-470nm blue light and surface-coated blue light-excited yellow-emitting phosphors, mainly cerium-doped yttrium aluminate phosphors. This commercial phosphor also has some disadvantages, mainly poor color saturation and instability of color tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/67C09K11/68C09K11/85C01B9/00C01B9/02C01B9/04C01B9/08
CPCC01B9/00C01B9/02C01B9/04C01B9/08C09K11/675C09K11/68C09K11/7705C09K11/7733Y02B20/00
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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