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Fluorescent material, preparation method thereof and light-emitting device

A fluorescent material and a technology that emits red light. It is applied in the fields of display, optoelectronics, and lighting technology. It can solve the problems of high price, good color rendering, and harsh preparation methods, and achieves improved luminous brightness, improved color rendering performance, and simple preparation. Effect

Active Publication Date: 2015-02-18
INNER MONGOLIA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former white LED has better brightness but poor color rendering, or the brightness is not high and the color rendering is better.
In addition, the preparation methods of the nitride and nitrogen oxide fluorescent materials used in these two methods are very harsh, so the price is relatively expensive

Method used

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  • Fluorescent material, preparation method thereof and light-emitting device
  • Fluorescent material, preparation method thereof and light-emitting device
  • Fluorescent material, preparation method thereof and light-emitting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Ca 0.8 Li 0.1 MoO 4-x f x : Eu 0.1 Preparation of fluorescent materials

[0037] Weigh various raw materials CaCO according to stoichiometric composition 3 , Li 2 CO 3 , Eu 2 o 3 , MoO 3 , NH 4 F, where NH is weighed 4 The molar masses of F are 0, 0.01, 0.02, 0.05, 0.08, 0.10, that is, the x values ​​are 0, 0.01, 0.02, 0.04, 0.08, 0.10. After the above 6 groups of raw materials are fully ball milled and mixed evenly, put them into a 99% porcelain crucible, keep warm at 500°C for 5 hours in an air atmosphere, then raise the temperature to 850°C and keep warm for 4 hours, cool the sintered body, crush, sieve, and classify. The chemical composition in the present invention is obtained as Ca 0.8 Eu 0.1 Li 0.1 MoO 4 : NH 4 F fluorescent material. where Ca 0.8 Li 0.1 MoO 3.92 f 0.08 : Eu 0.1 The excitation spectrum of figure 1 As shown, the emission spectra under different excitation light are as figure 2 Its maximum emission is shown at 6...

Embodiment 2

[0038] Example 2: Ca 0.72 Li 0.1 MoO 4-x f x : Eu 0.96 SM 0.04 Preparation of fluorescent materials

[0039] Weigh various raw materials CaCO according to stoichiometric composition 3 , Li 2 CO 3 , Eu 2 o 3 , MoO 3 , SmO 3 , NH 4 F, where NH is weighed 4 The molar masses of F are 0, 0.01, 0.02, 0.05, 0.08, 0.10, that is, the x values ​​are 0, 0.01, 0.02, 0.04, 0.08, 0.10. After the above 6 groups of raw materials are fully ball milled and mixed evenly, put them into a 99% porcelain crucible, keep warm at 500°C for 5 hours in an air atmosphere, then raise the temperature to 850°C and keep warm for 4 hours, cool the sintered body, crush, sieve, and classify. The chemical composition in the present invention is obtained as Ca 0.72 Li 0.1 O 4-x f x : Eu 0.96 SM 0.04 fluorescent material. Its excitation and emission spectral characteristics are basically consistent with those of Example 1. Different content of NH 4 The effect of F on the luminous intensity at...

Embodiment 3

[0040] Example 3: LiMo 2 o 8-x f 2x : Preparation of Eu fluorescent material

[0041] Weigh various raw materials Li according to stoichiometric composition 2 CO 3 , Eu 2 o 3 , MoO 3 , LiF, where the molar mass of LiF is weighed as 0, 0.01, 0.02, 0.05, 0.08, 0.10, that is, the x value is 0, 0.01, 0.02, 0.04, 0.08, 0.10. After the above 6 groups of raw materials are fully ball milled and mixed evenly, put them into a 99% porcelain crucible, keep warm at 500°C for 5 hours in an air atmosphere, then raise the temperature to 850°C and keep warm for 4 hours, cool the sintered body, crush, sieve, and classify. Obtaining the chemical composition in the present invention is LiMo 2 o 8-x f 2x : Eu fluorescent material. Its excitation and emission spectral characteristics are basically consistent with those of Example 1. The influence of different contents of LiF on the luminous intensity at 615nm is as follows: image 3 Shown in line 3.

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Abstract

The invention relates to a fluorescent material capable of being effectively stimulated by ultraviolet, purple-light or blue / green LEDs (Light Emitting Diodes) to emit red light as well as a preparation method thereof and a light-emitting device. The chemical general formula of the fluorescent material is MaAbQcOdDe:Rf, wherein M is one or more of Li, Na, K, Mg, Ca, Sr, Ba, Be, Zn, Y, Gd and Ga; A is one element of Li, Na, K and Bi; Q is at least one element of Mo and W; O is an oxygen element; R is at least one element of Eu, Nd, Dy, Ho, Tm, La, Ce, Er, Pr, Sm, Yb, Lu, Sb, Tb and Mn; D is one ion of Cl<->, F<->, Br<->, I<->, NH<4+>, Au<+> and Ag<+>; a, b, c, d, e and f are molar coefficients; a is more than or equal to 0.1 and less than or equal to 5, b is more than or equal to 0.01 and less than or equal to 3, c is more than 0 and less than or equal to 8, d is more than 1 and less than or equal to 32, e is more than or equal to 0 and less than or equal to 1, f is more than or equal to 0.001 and less than or equal to 1, the sum of a, b and f is more than or equal to 0.1 and less than or equal to 9, and 4c is equal to the sum of d and e. the preparation method comprises the following steps of uniformly grinding simple substances, compounds or corresponding salts of M, A, Q, R and D as well as fluxing agents, carrying out high-temperature synthesis, and processing to obtain the fluorescent material. The fluorescent material has the beneficial effects that the range of the excitation wavelength of the fluorescent material is wide (240nm-540nm), the light-emitting efficiency is high, crystals are complete, and the chemical performance is stable; the preparation method is simple, free of pollution, easy to operate and low in cost.

Description

technical field [0001] The invention belongs to the fields of lighting technology, display and optoelectronics, and relates to a red-emitting fluorescent material, a light-emitting device and a method for preparing the fluorescent material. Background technique [0002] Light Emitting Diode (Light Emitting Diode) is an energy conversion device that can convert electrical energy into light energy. It is the future light source of the world and is considered to be one of the most promising high-tech fields in the 21st century. As a new lighting technology, LED is triggering a revolution in the lighting field due to its long service life, low power consumption, flexible application, green environmental protection, convenient adjustment, and fast light response. With the rapid development of blue, purple and ultraviolet LEDs in recent years, it is possible for LEDs to replace traditional incandescent and fluorescent lamps for lighting. [0003] At present, in the field of exist...

Claims

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Application Information

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IPC IPC(8): C09K11/68C09K11/78C09K11/86H01L33/50
CPCH01L2224/32245H01L2224/48091H01L2224/48247H01L2224/48257H01L2224/49107H01L2224/73265H01L2224/8592H01L2924/181H01L2924/00012H01L2924/00014H01L2924/00
Inventor 朝克夫那日苏张敏特古斯
Owner INNER MONGOLIA NORMAL UNIVERSITY
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