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Europium-doped ultra-wideband red fluorescent material as well as preparation method and application thereof

A red fluorescent, ultra-broadband technology, applied in the field of europium-doped ultra-broadband red fluorescent materials and its preparation, can solve the problems of difficult realization of broadband red light emission, and achieve environmental protection and pollution-free preparation process, high luminous efficiency, and low raw material price cheap effect

Active Publication Date: 2021-07-30
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the broadband red emission of Eu2+ ions in oxide matrix is ​​still difficult to achieve

Method used

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  • Europium-doped ultra-wideband red fluorescent material as well as preparation method and application thereof
  • Europium-doped ultra-wideband red fluorescent material as well as preparation method and application thereof
  • Europium-doped ultra-wideband red fluorescent material as well as preparation method and application thereof

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Experimental program
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preparation example Construction

[0031] One of the above Eu 2+ -Eu 3+ The preparation method of the co-existing silicate red fluorescent powder adopts a high-temperature solid-phase method, and its basic steps are as follows:

[0032] Step (1), according to general chemical formula K 3 gSi 2 o 7: The stoichiometric ratio of the corresponding elements in xEu Weigh each raw material: a compound containing potassium ions, a compound containing gadolinium ions, a compound containing silicon ions, a compound containing europium ions; wherein, 0.002≤x≤0.2, Eu means Eu 2+ and Eu 3+ Ions that coexist in two different chemical valence states;

[0033] Step (2), mixing and fully grinding the raw materials in step (1), placing them in an air atmosphere for calcination, and then naturally cooling to normal temperature;

[0034] Preferably, the calcination temperature is 600-1000°C, and the calcination time is 2-24 hours;

[0035] Step (3), after the mixture calcined in step (2) is fully ground again, placed in a r...

Embodiment 1

[0040] Embodiment 1: preparation K 3 gSi 2 o 7 :0.002Eu

[0041] According to chemical formula K 3 gSi 2 o 7 : The stoichiometric ratio of each element in 0.002Eu, weigh K respectively 2 CO 3 : 0.4146g, Gd 2 o 3 : 0.3625g, SiO 2 : 0.2400g, Eu 2 o 3 : 0.000704g, placed in an agate mortar and fully ground, placed in a crucible after being uniformly ground, and calcined in an air atmosphere at a calcination temperature of 800°C for 6 hours, and after naturally cooling to room temperature, the sample was taken out. After the calcined sample mixture was thoroughly ground again, it was calcined in a reducing atmosphere at a temperature of 1200°C for 4 hours, and then naturally cooled to room temperature to obtain the target product K 3 gSi 2 o 7 :0.002Eu.

[0042] See attached figure 1 In a, is the X-ray diffraction pattern of the phosphor powder sample prepared according to the scheme of this embodiment. The XRD test results show that the main phase of the prepared...

Embodiment 2

[0045] Embodiment 2: preparation K 3 gSi 2 o 7 :0.005Eu

[0046] According to chemical formula K 3 gSi 2 o 7 : The stoichiometric ratio of each element in 0.005Eu, weigh K respectively 2 CO 3 : 0.4146g, Gd 2 o 3 : 0.3625g, SiO 2 : 0.2400g, Eu 2 o 3 : 0.00176g, placed in an agate mortar and fully ground, placed in a crucible after being uniformly ground, and calcined in an air atmosphere at a calcination temperature of 750°C and a calcination time of 10 hours. After naturally cooling to room temperature, the sample was taken out. After the calcined sample mixture was thoroughly ground again, it was calcined in a reducing atmosphere at a temperature of 1150 ° C for 8 hours, and then naturally cooled to room temperature to obtain the target product K 3 gSi 2 o 7 :0.005Eu.

[0047] See attached figure 1 In b, is the X-ray diffraction pattern of the phosphor powder sample prepared according to the scheme of this embodiment. The XRD test results show that the main p...

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Abstract

The invention discloses a europium-doped ultra-wideband red fluorescent material as well as a preparation method and application thereof. The chemical general formula of the material is K3GdSi2O7: xEu, wherein x is more than or equal to 0.002 and less than or equal to 0.2, and Eu refers to two ions coexisting in different chemical valence states of Eu < 2 + > and Eu < 3 + >. By changing the doping concentration and excitation wavelength of Eu, the chromaticity of the fluorescent powder can be controllably adjusted in a red light range. The fluorescent powder provided by the invention has a broadband excitation spectrum in ultraviolet and blue light regions (285nm to 500nm), and can be packaged on a high-brightness near ultraviolet LED chip to prepare a warm white light LED lighting device; the Eu < 2 + > fluorescent powder has ultra-wideband emission within the wavelength range of 500-815 nm, the full width at half maximum reaches up to 120 nm or above, ultra-wideband red light emission of Eu < 2 + > ions can be achieved, and the limitation that Eu < 2 + > ions in most silicate oxide fluorescent powder can only emit blue light, green light or yellow light is broken through.

Description

technical field [0001] The invention belongs to the field of solid-state lighting-oriented luminescent materials, and in particular relates to a europium-doped ultra-broadband red fluorescent material and a preparation method and application thereof. Background technique [0002] Fluorescent conversion white light-emitting diode (LED, Light Emitting Diode) has gradually replaced traditional incandescent and fluorescent lamps and has become the mainstream lighting source due to its advantages of high luminous efficiency, low energy consumption, long life, small size, environmental protection and pollution-free. Commercial white LEDs are mainly composed of InGaN blue chips and Y 3 al 5 o 12 : Ce 3+ (YAG:Ce 3+ ) yellow phosphor combination to achieve. However, due to the lack of red light components in the emission spectrum of this type of white LED, the color rendering index is low and the correlated color temperature is high, which restricts its further application in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79H01L33/50
CPCC09K11/7792H01L33/502Y02B20/00
Inventor 钟家松陆欣月沈飚毛启楠裴浪杨涛余华
Owner HANGZHOU DIANZI UNIV
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