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Phosphor for white light LED with adjustable emitting peak and its prepn process

An emission peak and phosphor technology, applied in the field of phosphors, can solve the problems of inability to meet the requirements of high-performance devices, narrow half-height widths of excitation and emission peaks, and low effective conversion efficiency of phosphors, and achieves low equipment cost, stable performance, Easy-to-operate effects

Inactive Publication Date: 2007-11-07
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, great progress has been made in the research and development of phosphors using gallium nitride (GaN) blue LED (emission peak at 460nm) combined with YAG to produce white light. Although the technology is quite mature, the luminous efficiency of blue LED is low.
Currently, the effective conversion efficiency of phosphors that can be applied to white LEDs is low, which cannot meet the requirements of high-performance devices, especially the types of red phosphors are few, and the efficiency is low (Chinese patent 03149752.7)
U.S. patents report several sulfide red phosphors, which have a wide fluorescence spectrum, but poor stability, and cause color drift during device use. Therefore, the development of new phosphors emitting red light for white LEDs has become a research hotspot at home and abroad. (United States Patent, 2000, Patent No.: 6252254)
In recent years, research on molybdate fluorescent materials used as white light LEDs is in the ascendant, but the half maximum width of its excitation and emission peaks is narrow, which affects its application in white light LEDs (Yunsheng Hu, Weidong Zhuang, Hongqi Ye. "A novel red phosphor for white light emitting diodes” [J] Journal of Alloys and Compounds 390(2005): 226-229)

Method used

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  • Phosphor for white light LED with adjustable emitting peak and its prepn process
  • Phosphor for white light LED with adjustable emitting peak and its prepn process
  • Phosphor for white light LED with adjustable emitting peak and its prepn process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Ca 0.85 WO 4 :Eu 0.15 The preparation of fluorescent powder, the specific implementation process is as follows:

[0032] Weigh CaCO according to the molar ratio of the above stoichiometric formula 3 (AR) 1.7015g, WO 3 (AR) 4.6370g, Eu 2 o 3 (4N)0.5282g, H 3 BO 3 (AR) 0.3433g. After the above-mentioned raw materials are fully ground and uniform, they are put into an alumina crucible and heat-treated in an air atmosphere at 1000°C for 3 hours. The heat-treated product is crushed, washed with water to remove impurities, filtered, and dried at 90°C to obtain the chemical composition of Ca 0.85 WO 4 :Eu 0.15 of red phosphor. The excitation spectrum is shown in Figure 1, the emission spectrum is shown in Figure 2, and the fluorescence data are shown in Table 1. It can be seen from the chart data that the phosphor can be effectively excited by ultraviolet, purple or blue light in the range of 250-480nm.

[0033] Example

Embodiment 2

[0035] (Ca 0.5 Mg 0.35 )(W 0.8 Mo 0.2 )O 4 :Eu 0.15 The preparation of fluorescent powder, the specific implementation process is as follows:

[0036] Weigh CaCO according to the molar ratio of the above stoichiometric formula 3 (AR)0.8508g, (MgCO 3 ).Mg(OH) 2 .5H 2 O(AR)0.6801g, (AR)WO 3 (AR) 3.7096g, MoO 3 (AR) 0.5758g, Eu 2 o 3 (4N)0.5282g, H 3 BO 3 (AR) 0.3172g. After the above-mentioned raw materials are fully ground and uniform, they are put into an alumina crucible and heat-treated in an air atmosphere at 1050°C for 2.5 hours. The heat-treated product is crushed, pickled to remove impurities, filtered, and dried at 100°C to obtain the chemical composition of Ca 0.85 (W 0.8 Mo 0.2 )O 4 :Eu 0.15 of red phosphor. The excitation spectrum is shown in Figure 3, the emission spectrum is shown in Figure 4, and the fluorescence data are shown in Table 1. It can be seen from the chart data that the phosphor can be effectively excited by ultraviolet, purple o...

Embodiment 3

[0038] (Ca 0.5 Sr 0.35 )(W 0.5 Mo 0.5 )O 4 :Eu 0.15 The preparation of fluorescent powder, the specific implementation process is as follows:

[0039] Weigh CaCO according to the molar ratio of the above stoichiometric formula 3 (AR) 0.8508g, SrCO 3 (AR) 1.0333g, WO 3 (AR) 2.3185g, MoO 3 (AR) 1.4394g, Eu 2 o 3 (4N)0.5282g, H 3 BO 3 (AR) 0.3085g. After the above-mentioned raw materials are fully ground and uniform, they are put into an alumina crucible and heat-treated in an air atmosphere at 1100°C for 2 hours. The heat-treated product is crushed, washed with alkali and water to remove impurities, filtered, and dried at 80°C to obtain the chemical composition of Ca 0.85 (W 0.5 Mo 0.5 )O 4 :Eu 0.15 of red phosphor. The excitation spectrum is shown in Figure 5, the emission spectrum is shown in Figure 6, and the fluorescence data are shown in Table 1. It can be seen from the chart data that the phosphor can be effectively excited by ultraviolet, purple or blu...

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Abstract

The present invention is one kind of phosphor for white LED with adjustable emitting peak and its preparation process. The phosphor has stable chemical property and good light emitting performance, and may be excited effectively by UV ray, purple light or blue light to eliminate red light, with the other emitting peak in UV ray excitation being adjustable from red region to green region. The phosphor has the structural formula of A1-x(W1-yMoy)O4:Eux, where, A is at least one of Li, Na, K, Mg, Ca, Sr and Ba, x is 0-0.35, and y is 0-1. It is prepared with oxide or salt containing the A element, oxide or salt containing W and Mo, oxide or salt containing Eu2+ and fluxing agent H3BO3, and through mixing, heat treatment, cooling and post-treatment.

Description

technical field [0001] The present invention relates to a phosphor, in particular to a rare-earth phosphor that can be effectively excited by ultraviolet, purple or blue LEDs to emit red light, and another emission peak that appears during ultraviolet excitation can be adjusted from red light to green light Materials and their preparation methods. Background technique [0002] Light Emitting Diode (Light Emitting Diode) is an energy conversion device that can convert electrical energy into light energy. It has low operating voltage, low power consumption, stable performance, long life, strong impact resistance, vibration resistance, light weight and It has the advantages of fast luminous response, so it is widely used in the fields of display devices, general lighting, indicator lights and signal lights (Xu Shurong, Su Mianzeng. Luminescent Optics and Luminescent Materials [M]. Beijing: Chemical Industry Press, 2004) . [0003] At present, there are mainly two types of whi...

Claims

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Application Information

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IPC IPC(8): C09K11/78H01L33/00H01L33/50
CPCY02B20/181Y02B20/00
Inventor 熊兆贤陈亚勇
Owner XIAMEN UNIV
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