Warm white fluorescent powder excited by ultraviolet LED

A phosphor, warm white technology, applied in the field of rare earth luminescent materials, can solve the problems of low excitation efficiency, high cost, poor stability of phosphors, etc.

Active Publication Date: 2016-06-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the development process of LED phosphors, silicates, borates, tungstomolybdates, germanates, sulfides, sulfur oxides, et

Method used

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  • Warm white fluorescent powder excited by ultraviolet LED
  • Warm white fluorescent powder excited by ultraviolet LED
  • Warm white fluorescent powder excited by ultraviolet LED

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1: In 0.974 Dy 0.01 Tm 0.01 Eu 0.006 NbO 4 Preparation of phosphor

[0034] Weigh 0.9701gNb 2 O 5 , 0.9869gIn 2 O 3 , 0.0136gDy 2 O 3 , 0.0141gTm 2 O 3 And 0.0077g Eu, grind in an agate mortar for 15 minutes to mix the raw materials uniformly. The mixed raw materials are placed in a corundum crucible, and the temperature is raised to 1000°C at a rate of 5°C / min in a resistance furnace for the first stage sintering, and the sintering time is 12h. Then with the furnace cooling, the sintered product was ground for 10 minutes, and then heated to 1250°C at a rate of 5°C / min for the second stage sintering, and the sintering time was 24 hours. After cooling in the furnace, grinding, you can get the composition of In 0.98 Dy 0.01 Tm 0.01 NbO 4 Of phosphors.

Example Embodiment

[0035] Example 2: In 0.98 Dy 0.01 Tm 0.01 NbO 4 Preparation of phosphor

[0036] Weigh 0.9701gNb 2 O 5 , 0.9930gIn 2 O 3 , 0.0136gDy 2 O 3 And 0.0141gTm 2 O 3 , The remaining steps are the same as in Example 1.

Example Embodiment

[0037] Example 3: In 0.97 Dy 0.01 Tm 0.01 Eu 0.01 NbO 4 Preparation of phosphor

[0038] Weigh 0.9701gNb 2 O 5 , 0.9869gIn 2 O 3 , 0.0136gDy 2 O 3 , 0.0141gTm 2 O 3 And 0.0128gEu, and the remaining steps are the same as in Example 1.

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Abstract

The invention relates to a warm white fluorescent powder excited by an ultraviolet LED. According to the fluorescent powder, InNbO4 serves as a host material, and the warm white fluorescent powder In1-x-y-zDyxTmyEuzNbO4 is obtained by simultaneously doping rare earth ions such as 0.01-0.05at.% of Dy3+, 0.01-0.05at.% of Tm+3+ and 0-0.03at.% of Eu3+ into the In3+ position, wherein x ranges from 0.01 to 0.05, y ranges from 0.01 to 0.05, and z ranges from 0 to 0.03. The rare-earth-doped niobate-based warm white fluorescent powder for the LED has the advantages of being simple in preparing process, high in light-emitting intensity, adjustable in color, capable of achieving a warm color, short in fall time, good in stability and the like, and can be widely applied to the LED field.

Description

Technical field: [0001] The invention relates to the field of rare earth luminescent materials, in particular to a warm white fluorescent powder that can be applied to ultraviolet excitation of a light emitting diode (LED). Background technique: [0002] White LED has significant advantages such as high luminous efficiency, long life, small size, fast conversion, energy saving and environmental protection, and has incomparable advantages over other traditional lighting sources. It has broad application prospects in the fields of green lighting and information display. At present, the preparation of white LEDs mainly includes three methods, one is to use blue LEDs to excite yellow phosphors; the other is to use ultraviolet LEDs to excite red, green and blue three-primary color mixed phosphors; Light emitting devices. It can be seen that phosphor, as an important part of LED light conversion, is very important to the lighting and display industry. LED chip and packaging tech...

Claims

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Application Information

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IPC IPC(8): C09K11/67C09K11/78
CPCC09K11/7783
Inventor 蔡格梅苏柳梅樊星金展鹏
Owner CENT SOUTH UNIV
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