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A warm white phosphor excited by UV LEDs

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

Active Publication Date: 2018-04-03
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, etc. There are disadvantages such as poor stability, low excitation efficiency, and high cost, and have not been widely used.

Method used

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  • A warm white phosphor excited by UV LEDs
  • A warm white phosphor excited by UV LEDs
  • A warm white phosphor excited by UV LEDs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: In 0.974 Dy 0.01 T m 0.01 Eu 0.006 NbO 4 Phosphor powder preparation

[0034] Weigh 0.9701g Nb 2 o 5 , 0.9869g In 2 o 3 , 0.0136g Dy 2 o 3 , 0.0141g Tm 2 o 3 and 0.0077g Eu, and ground it in an agate mortar for 15 minutes to mix the raw materials evenly. The mixed raw materials were placed in a corundum crucible, and the temperature was raised to 1000°C in a resistance furnace at a rate of 5°C / min for the first-stage sintering, and the sintering time was 12h. Then cool down with the furnace, grind the sintered product for 10 minutes, and then raise the temperature to 1250°C at a speed of 5°C / min for the second-stage sintering, and the sintering time is 24h. Grinding after cooling in the furnace, the composition can be obtained as In 0.98 Dy 0.01 T m 0.01 NbO 4 of fluorescent powder.

Embodiment 2

[0035] Example 2: In 0.98 Dy 0.01 T m 0.01 NbO 4 Phosphor powder preparation

[0036] Weigh 0.9701g Nb 2 o 5 , 0.9930g In 2 o 3 , 0.0136g Dy 2 o 3 and 0.0141g Tm 2 o 3 , the rest of the steps are the same as in Example 1.

Embodiment 3

[0037] Example 3: In 0.97 Dy 0.01 T m 0.01 Eu 0.01 NbO 4 Phosphor powder preparation

[0038] Weigh 0.9701g Nb 2 o 5 , 0.9869g In 2 o 3 , 0.0136g Dy 2 o 3 , 0.0141g Tm 2 o 3 And 0.0128g Eu, all the other steps are identical with embodiment 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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Patent Type & Authority Patents(China)
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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