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Double-perovskite structured red fluorescent powder as well as preparation method and application thereof

A technology of red fluorescent powder and double perovskite, which is applied in the field of fluorescent materials, can solve the problems of luminous intensity attenuation, poor service stability, and complicated preparation, and achieve the effects of stable chemical properties, simple preparation process, and excellent luminous performance

Active Publication Date: 2011-11-23
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Commercial red phosphors for white LEDs (such as Sr 2 Si 5 N 8 :Eu 2+ , ZnS:Cu 2+ etc.) are limited to nitride, oxynitride and sulfide substrates, and have the characteristics of complex preparation, high cost, and poor service stability.
Even, YAG:Ce 3+ Yellow powder will have 20% luminous intensity attenuation at 80°C

Method used

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  • Double-perovskite structured red fluorescent powder as well as preparation method and application thereof
  • Double-perovskite structured red fluorescent powder as well as preparation method and application thereof
  • Double-perovskite structured red fluorescent powder as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0018] First, the raw material La 2 o 3 、Na 2 CO 3 、 Ta 2 o 5 、Eu 2 o 3 According to La 1.8 NaTaO 6 : The stoichiometric ratio of 0.2Eu is weighed, and the mixture is refined and fully mixed by ball milling; then the ball-milled mixture is put into a corundum crucible, and pre-fired in the furnace at a temperature of 1000°C. The time is 12 hours; the pre-fired powder is ground and fired again at 1400°C, and the reaction time is 12 hours; the prepared phosphor is ball milled, refined and sieved to obtain a pure-phase red fluorescent material (XRD see figure 1 ), the excitation spectrum of the sample is shown in figure 2 , the fluorescence emission intensity at 611nm under the excitation of 465nm blue light reaches 3060000 (see image 3 ), the fluorescence emission intensity at 611nm under the excitation of 465nm blue light reaches 1360000, and the fluorescence emission intensity at 617nm under the excitation of 395nm near ultraviolet light reaches 920000.

Embodiment 2

[0020] First, the raw material La 2 o 3 、Na 2 CO 3 、 Ta 2 o 5 、Eu 2 o 3 According to La 1.8 NaTaO 6 : The stoichiometric ratio of 0.2Eu is weighed, and the mixture is refined and fully mixed by ball milling; then the ball-milled mixture is put into a corundum crucible, and pre-fired in the furnace at a temperature of 500 ° C. The time is 24h; the powder obtained by pre-calcination is ground and fired again at 1000°C, and the reaction time is 12h; the powder obtained by pre-fire is ground and fired again at 1400°C, and the reaction time is 12h. The prepared fluorescent powder is ball milled, refined and sieved to obtain a pure-phase red fluorescent material, and the fluorescent emission intensity of the sample at 611nm under the excitation of 465nm blue light reaches 3,500,000.

Embodiment 3

[0022] First, the raw material La 2 o 3 、Na 2 CO 3 、 Ta 2 o 5 、Eu 2 o 3 According to La 1.8 NaTaO 6 : Weigh the stoichiometric ratio of 0.2Eu, use ball milling to refine the mixture and fully mix; then put the ball milled mixture into a corundum crucible, and directly fire it in the furnace without pre-firing , the temperature is 1400°C, and the time is 48h. The prepared fluorescent powder is ball-milled, refined and sieved to obtain a pure-phase red fluorescent material, and the fluorescent emission intensity of the sample at 611nm under the excitation of 465nm blue light reaches 2,000,000.

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Abstract

The invention discloses double-perovskite structured red fluorescent powder as well as a preparation method and application thereof, belonging to the field of fluorescent materials. The chemical formula of the fluorescent powder can be shown as Ln2-xAMO6:xEu and meets the following conditions: Ln is one, two or three of La, Gd and Y; A is one, two or three of Li, Na and K; M is one, two or three of Sb, Nb and Ta; and Eu is a luminescent center and is doped in the Ln position and the doping value x is 0.01-1.0. The fluorescent powder disclosed by the invention can emit fluorescence of 570-640 nm under the excitation of a green light chip (528-533 nm), a blue light chip (460-470 nm) or a near-ultraviolet light chip (390-399 nm), and red fluorescence is of 600-620 nm. The fluorescent powder can be used for white LED (light-emitting diode) and related display and lighting devices, has a simple preparation process, stable chemical properties and excellent luminescent performance, and is ideal fluorescent powder used for white LED.

Description

technical field [0001] The invention specifically relates to a red fluorescent powder with a double perovskite structure and a preparation method and application thereof, belonging to the field of fluorescent materials. Background technique [0002] White light LED is the fourth generation of lighting electric light source after incandescent lamps, fluorescent lamps and energy-saving lamps. It is called the green light source of the 21st century. Lightweight, fast response, low working voltage and good safety. It is the trend of the times to replace traditional lighting sources with LED solid-state light sources. [0003] At present, the way of white light LED to emit white light is mainly by using phosphor powder conversion method. Commercialized white LEDs are composed of blue-emitting (460nm) InGaN dies and yellow-emitting YAG:Ce. This method is simple in process and low in cost. However, this method has the disadvantages of poor color rendering and high color tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78H01L33/50
CPCY02B20/181Y02B20/00
Inventor 黄富强杨重寅徐科殷鑫
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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