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Fluorescent powder with high thermal stability for white light LED

A technology of high thermal stability and phosphor powder, applied in the field of phosphor powder, can solve the problems of very sensitive surrounding environment, re-absorption of phosphor powder, color drift, etc., and achieve the effects of excellent thermal stability, simple preparation process and lower production cost.

Pending Publication Date: 2021-04-16
XINYI XIYI ADVANCED MATERIALS RES INST OF IND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such white LEDs suffer from the following disadvantages: low stability, color shift due to inconsistent light attenuation, and reabsorption between different phosphors
But because its transition is very sensitive to the surrounding environment

Method used

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  • Fluorescent powder with high thermal stability for white light LED
  • Fluorescent powder with high thermal stability for white light LED
  • Fluorescent powder with high thermal stability for white light LED

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Ba 19 Li 2 Mg(PO 4 ) 14 : 0.005Dy 3+ , 0.01Tm 3+

[0016] Firstly, Li with a purity greater than 99.9% was weighed according to the stoichiometric ratio. 2 O, BaCO 3 , MgCO 3 , (NH 4 ) 2 HPO 4 、Tm 2 o 3 and Dy 2 o 3 , after mixing well, grind in an agate mortar. Then, the mixed raw materials were calcined at 1350° C. for 4 hours, finally cooled to room temperature gradually, and ground again to obtain the phosphor powder.

Embodiment 2

[0017] Example 2: Ba 19 Li 2 Mg(PO 4 ) 14 : 0.01Dy 3+ , 0.01Tm 3+

[0018] Firstly, Li with a purity greater than 99.9% was weighed according to the stoichiometric ratio. 2 O, BaCO 3 , MgCO 3 , (NH 4 ) 2 HPO 4 、Tm 2 o 3 and Dy 2 o 3 , after mixing well, grind in an agate mortar. Then, the mixed raw materials were calcined at 1100° C. for 8 hours, finally cooled to room temperature gradually, and grinded again to obtain the phosphor powder.

Embodiment 3

[0019] Example 3: Ba 19 Li 2 Mg(PO 4 ) 14 : 0.03Dy 3+ , 0.01Tm 3+

[0020] Firstly, Li with a purity greater than 99.9% was weighed according to the stoichiometric ratio. 2 O, BaCO 3 , MgCO 3 , (NH 4 ) 2 HPO 4 、Tm 2 o 3 and Dy 2 o 3 , after mixing well, grind in an agate mortar. Then, the mixed raw materials were calcined at 1200° C. for 5 hours, finally cooled to room temperature gradually, and ground again to obtain the phosphor.

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PUM

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Abstract

The invention relates to fluorescent powder with high thermal stability for a white-light LED (Light Emitting Diode), which belongs to the field of luminescent materials, meets the chemical formula of Ba19Li2Mg (PO4) 14: xDy < 3 + >, 0.01 Tm < 3 + >, is prepared by a solid-phase high-temperature sintering method, and realizes white-light emission by co-doping Tm < 3 + > and Dy < 3 + >. Meanwhile, the fluorescent powder prepared by the invention also shows excellent thermal stability, and when the temperature rises to 235 DEG C, the emission intensity of the Tm < 3 + > and Dy < 3 + > co-doped fluorescent powder still keeps 80-91% of the room-temperature emission intensity.

Description

technical field [0001] The invention provides a phosphor powder with high thermal stability for white light LEDs, belonging to the technical field of preparation and application of luminescent materials. Background technique [0002] White LEDs (WLEDs) exhibit many advantages over traditional lighting sources, such as high conversion efficiency, environmental protection, and long lifespan. At present, the efficiency of commercial white LEDs can reach about 30%, which is 6 times the efficiency of incandescent lamps. So far, white LEDs can be achieved in a number of ways. One of the methods is to use yellow luminescent phosphor YAG: Ce 3+ With blue light-emitting InGaN chip. The disadvantage of this method is the lack of red components in the final spectrum, so this type of white LED usually suffers from poor color rendering index (CRI, Ra<80) and high correlated color temperature (CCT>4500K). In addition, blue, green, and red-emitting phosphors (tricolor phosphors) ...

Claims

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Application Information

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IPC IPC(8): C09K11/71H01L33/50
CPCY02B20/00
Inventor 张乐甄方正邵岑陈东顺申冰磊邱凡
Owner XINYI XIYI ADVANCED MATERIALS RES INST OF IND TECH CO LTD
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