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Near-ultraviolet-excited double perovskite single-matrix white-light fluorescent material and its preparation and application

A technology of double perovskite and fluorescent materials, which is applied in the fields of luminescent materials, climate sustainability, semiconductor devices, etc., and can solve problems such as difficulty in ratio control, high correlated color temperature, and different degradation rates of phosphors.

Active Publication Date: 2020-07-10
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the purpose of the present invention is to provide a near-ultraviolet excited double perovskite single-matrix white light fluorescent material and its preparation and application. By selecting a double perovskite material with a specific composition as a white light Fluorescent materials (especially single-matrix white light fluorescent materials), and further improve the composition of the two types of B-site elements in the double perovskite, part of B is replaced by C, and part of B' is replaced by rare earth element Ln, And by controlling and substituting the corresponding mole fractions x and y, compared with the existing technology, it can effectively solve the problems of low color rendering index, high correlated color temperature of white LED, or different degradation rates between different phosphors and difficult ratio control. The obtained near-ultraviolet-excited double perovskite single-matrix white-light fluorescent material and YAG:Ce 3+ Compared with simple preparation, the emission spectrum range is wider and can be excited by ultraviolet light, especially suitable for white light LED devices excited by ultraviolet light

Method used

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  • Near-ultraviolet-excited double perovskite single-matrix white-light fluorescent material and its preparation and application
  • Near-ultraviolet-excited double perovskite single-matrix white-light fluorescent material and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Cs 2 Na 0.4 Ag 0.6 InCl 6 Phosphor powder preparation.

[0038] The preparation method is as follows:

[0039] Weigh 2mmol of cesium chloride (CsCl), 0.6mmol of silver chloride (AgCl), 0.4mmol of sodium chloride (NaCl) and 1mmol of indium chloride (InCl) 3 ), the purity of the above raw materials is more than 99.9%. The weighed above-mentioned raw materials were poured into a 25ml hydrothermal kettle, and then 5ml of hydrochloric acid (36-38%) was added. The hydrothermal kettle was put into a muffle furnace and kept at 180°C for 10 hours, and then cooled to room temperature at a rate of 3°C / h. After cooling down to room temperature, the solid matter in the hydrothermal kettle was taken out and washed twice with ethanol. Put the rinsed solid matter into an oven and bake at 80° C. for 8 hours until completely dry. The dried solid was ground in an agate mortar.

[0040] The emission wavelength of the rare earth ion-doped perovskite phosphor powder prepared in this...

Embodiment 2

[0042] Cs 2 Ag 0.6 Na 0.4 In 0.98 Eu 0.02 Cl 6 Phosphor powder preparation.

[0043] The preparation method is as follows:

[0044] Weigh respectively 2mmol cesium chloride (CsCl), 0.6mmol silver chloride (AgCl), 0.4mmol sodium chloride (NaCl), 0.98mmol indium chloride (InCl) 3 ) and 0.02mmol europium chloride (EuCl 3 ), the purity of the above raw materials is more than 99.9%. The weighed above-mentioned raw materials were poured into a 25ml hydrothermal kettle, and then 10ml of hydrochloric acid was added. The hydrothermal kettle was put into a muffle furnace and kept at 180°C for 12 hours, and then cooled to room temperature at a rate of 6°C / h. After cooling down to room temperature, the solid matter in the hydrothermal kettle was taken out and washed with ethanol for 3 times. Put the rinsed solid matter into an oven and bake at 80° C. for 10 hours until completely dry. The dried solid was ground in an agate mortar.

[0045] The emission wavelength of the rare e...

Embodiment 3

[0047] Cs 2 Ag 0.6 Na 0.4 In 0.9 Eu 0.1 Cl 6 Phosphor powder preparation.

[0048] The preparation method is as follows:

[0049] Weigh respectively 2mmol cesium chloride (CsCl), 0.6mmol silver chloride (AgCl), 0.4mmol sodium chloride (NaCl), 0.9mmol indium chloride (InCl) 3 ) and 0.1 mmol europium chloride (EuCl 3 ), the purity of the above raw materials is more than 99.9%. The weighed above-mentioned raw materials were poured into a 25ml hydrothermal kettle, and then 5ml of hydrochloric acid was added. Put the hydrothermal kettle into a muffle furnace and keep it at 170°C for 15 hours, and then lower it to room temperature at a rate of 15°C / h. After cooling down to room temperature, the solid matter in the hydrothermal kettle was taken out and washed 6 times with ethanol. Put the rinsed solid matter into an oven and bake at 80° C. for 20 hours until completely dry. The dried solid was ground in an agate mortar.

[0050] The emission wavelength of the rare earth i...

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Abstract

The invention discloses a near ultraviolet excited double perovskite single matrix white light fluorescent material and preparation and application thereof. The chemical formula of the double perovskite material meets A<2>B<1-x>C<x>B'<1-y>Ln<y>X<6>, wherein A, B and C are one or combination of more of normal monovalent cations or cationic groups, and A, B and C are different from one another; B' is one or combination of more of Al, Bi, In normal trivalent cations or cationic groups; and Ln is one or combination of more of various kinds of normal trivalent rare earth elements. The double perovskite material can particularly be applied for serving as white light fluorescent materials. Formation of two sorts of B-site elements of the double perovskite is improved, part of B is replaced with C, part of B' is replaced with rare earth element Ln, and by controlling and replacing the corresponding mole fraction x and y, the near ultraviolet excited double perovskite single matrix white lightfluorescent material is accordingly obtained. Compared with YAG (yttrium aluminum garnet):Ce<3+>, the near ultraviolet excited double perovskite single matrix white light fluorescent material is widerin emission spectrum range, simple to prepare, and particularly suitable for being applied to white light LED (light-emitting diode) devices.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and more specifically relates to a near-ultraviolet-excited double perovskite single-matrix white-light fluorescent material and its preparation and application. The near-ultraviolet-excited double-perovskite single-matrix white light fluorescent material can be obtained by The halide inorganic double perovskite phosphor obtained by doping rare earth ions has a wide emission spectrum range and is easy to prepare, and can be used as an inorganic phosphor material for semiconductor lighting (such as white LED). Background technique [0002] With the development of society, while people's material life is greatly enriched, they also put forward higher requirements for the quality of life. In today's society, people's lighting concept has been upgraded from the demand for brightness to the demand for color temperature and color rendering index. At present, there are two main methods to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/62C09K11/85H01L33/50H01L33/56
CPCC09K11/628C09K11/7705C09K11/7733H01L33/502H01L33/56Y02B20/00
Inventor 唐江胡青松牛广达罗家俊李顺然刘婧张成
Owner HUAZHONG UNIV OF SCI & TECH
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