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Silicate green fluorescent powder used for LEDs and preparation method thereof

A green phosphor, silicate technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of high cost, high synthesis temperature, complex process, etc., and achieves improved luminous intensity, reduced calcination temperature, and high luminous intensity. Effect

Inactive Publication Date: 2013-12-25
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-temperature solid-phase method has the advantages of simple operation and simple process, but the synthesis temperature is high, the calcination and heat preservation time are long, often requires multiple calcinations, the phase is mixed, the particles are uneven, and subsequent crushing will greatly reduce the luminous performance and usability
Patent CN102643642A uses Sol-gel method to synthesize Sr or Ca-doped Ba 2 SiO 4 : Eu fluorescent powder; CN102408890A adopts Sol-gel to synthesize the M of different alkali metal, alkaline earth metal ion doping 2 SiO 4 : Eu phosphor, although the phosphor particles synthesized by Sol-gel are fine, but the process is complicated, the cost is high, toxic, polluting, harmful to human body, and not conducive to environmental protection

Method used

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  • Silicate green fluorescent powder used for LEDs and preparation method thereof
  • Silicate green fluorescent powder used for LEDs and preparation method thereof
  • Silicate green fluorescent powder used for LEDs and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment example 1

[0026] According to chemical formula Ba 1.95 SiO 4 :Eu 2+ 0.01 , Li + 0.02 ,Er 3+ 0.02 Weigh BaCl 2 2H 2 O (A.R.) 1.95mol, LiCl (A.R.) 0.02mol, SiO 2 (nanoscale) 1mol, Eu 2 o 3 (99.99%)0.005mol, Er 2 o 3 (99.99%) 0.01mol;; then weigh 0.8wt% of the total mass of the above drugs, the surfactant polyethylene glycol; prepare the precipitant NH 4 HCO 3 solution, the concentration is 1.5mol / L; the weighed Eu 2 o 3 、Er 2 o3 Dissolve with an appropriate amount of hydrochloric acid, add an appropriate amount of deionized water and heat to 50°C for water bath treatment; add BaCl to the above solution 2 2H 2 O(A.R.), LiCl(A.R.), SiO 2 (nano-level), polyethylene glycol, stir simultaneously, add dropwise precipitating agent, adjust PH=9, continue to stir for 3 hours; Dry directly, obtain fluffy precursor; Precursor is placed in by hydrogen (H 2 ) in an atmosphere furnace providing a reducing atmosphere, the calcination temperature is 1150° C., and the calcination time i...

Embodiment example 2

[0028] According to chemical formula Ba 1.9125 SiO 4 :Eu 2+ 0.03 , Li + 0.1 ,Er 3+ 0.005 Weigh Ba (NO 3 ) 2 (A.R.) 1.9125mol, LiNO 3 (A.R.) 0.1mol, SiO 2 (nanoscale) 1mol, Eu 2 o 3 (99.99%)0.015mol, Er 2 o 3 (99.99%) 0.0025mol; then weigh the surfactant polyethylene glycol of 0.6wt% of the total mass of the above drug; prepare a precipitant (NH 4 ) 2 C 2 o 4 +NH 3 ·H 2 O solution with a concentration of 1mol / L; the weighed Eu 2 o 3 、Er 2 o 3 Dissolve with an appropriate amount of nitric acid, add an appropriate amount of deionized water and heat to 45°C for water bath treatment; add Ba(NO 3 ) 2 (A.R.), LiNO 3 (A.R.), SiO 2 (nano-level), polyethylene glycol, stir simultaneously, add dropwise precipitant, adjust PH=9, continue to stir for 3.5 hours; Dry directly, obtain fluffy precursor; 2 and N 2 ) in an atmosphere furnace providing a reducing atmosphere, the calcination temperature is 1200° C., and the calcination time is 3 hours to obtain the targ...

Embodiment example 3

[0030] According to chemical formula Ba 1.94 SiO 4 :Eu 2+ 0.05 , Li + 0.005 ,Er 3+ 0.005 Weigh BaCl 2 2H 2 O (A.R.) 1.94mol, LiCl (A.R.) 0.005mol, SiO 2 (nanoscale) 1mol, Eu 2 o 3 (99.99%)0.025mol Er 2 o 3 (99.99%) 0.0025mol; Then take by weighing the surfactant polyethylene glycol of 0.4wt% of the total mass of the above medicines; prepare precipitant (NH 4 ) 2 CO 3 solution, the concentration is 1mol / L; the weighed Eu 2 o 3 、Er 2 o 3 Dissolve with an appropriate amount of hydrochloric acid, add an appropriate amount of deionized water and heat to 40°C for water bath treatment; add BaCl to the above solution 2 2H 2 O(A.R.), LiCl(A.R.), SiO 2 (nanoscale), polyethylene glycol, stirring at the same time, dropwise adding precipitant, adjust PH=8, continue to stir for 3.5 hours; directly dry to obtain a fluffy precursor; Calcined in an atmosphere furnace with a neutral atmosphere, the calcination temperature is 1250° C., and the calcination time is 2.5 hours ...

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Abstract

The invention discloses a doped system of silicate green fluorescent powder and a preparation method of the doped system of the silicate green fluorescent powder, and belongs to the technical field of luminescent materials. The chemical formula of the silicate green fluorescent powder is , wherein0<=x<=0.25, 0<y<=0.02 and 0<z<=0.1.. The method includes the specific steps that according to the stoichiometric ratio of all the elements in the chemical formula, barium salt, lithium salt, silica, europium oxide, erbium oxide and a moderate amount of surfactant are weighed; a precipitating agent solution is prepared; the europium oxide and the erbium oxide are dissolved with concentrated acid, and water bath processing is performed after a moderate amount of deionized water is added; then the barium salt, the lithium salt, the silica and the surfactant are added and stirred continuously, the precipitating agent is dripped in, the PH is adjusted to be larger than or equal to 7, and the mixture is continuously stirred for 1-4 hours; drying is directly performed, and a precursor is obtained; the precursor is placed in an atmosphere furnace with reducing atmosphere and calcined at 1000-1300 DEG C for 1-7 hours, and the needed fluorescent powder is obtained. The green fluorescent powder used for LEDs is high in luminescence intensity, good in stability and color rendering performance and applicable to exciting near ultraviolet radiation InGaN tube cores.

Description

technical field [0001] The invention belongs to the technical field of LED light-emitting materials, and in particular relates to a silicate green fluorescent powder and a preparation method thereof. Background technique [0002] LED (light emitting diode) is a new type of light-emitting device that emits near-ultraviolet light or visible light under the drive of low-voltage direct current (2.5-16V). White light LED is a new white light emitting LED device developed based on traditional LED. Compared with traditional lighting sources, it has energy saving, environmental protection, long life, low consumption, low heat, high brightness, waterproof, shockproof, concentrated beam, maintenance It is known as the fourth-generation green lighting source, which is of great significance to energy saving and environmental protection. [0003] At present, the realization of white light LED is that the blue light GaInN chip excites YAG (Y 3 Al 5 o 12 : Ce 3+ ) Phosphor powder prod...

Claims

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Application Information

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IPC IPC(8): C09K11/59
Inventor 朱达川罗林龄涂铭旌
Owner SICHUAN UNIV
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