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The Synthesis and Luminescence Property of Eu2+ 、Ce3+ Doped CaSi2O2N2 Phosphor

Author: ZhaoZuoRan
Tutor: FuRenLi
School: Nanjing University of Aeronautics and Astronautics
Course: Materials Science
Keywords: White LED Silicon oxynitride Phosphor Fluorescence Properties Rare-earth ions
CLC: O482.31
Type: Master's thesis
Year: 2010
Downloads: 114
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Abstract


This paper studies CaSi 2 O 2 N 2 : Eu 2 of the preparation process and Ca 1 -x Eu x Si 2 O - δN2 2/3δ (δ = 0,1) phosphor fluorescent properties, right CaSi 2 O 2 N 2 : Eu 2 of redshift in-depth discussions; using HF acid treatment on CaSi 2 O 2 N 2 : Eu 2 morphology and fluorescence properties were improved; synthesis the CaSi 2 O 2 N 2 : (Eu 2 / Ce 3 ) phosphor, studied the fluorescence properties and Ce 3 → Eu 2 of energy transfer. The experimental results and computational analysis showed that: in 1200 ° C -1500 ° C under all synthetic CaSi 2 O 2 N 2 : Eu 2 (δ = 0) fluorescent material, the length of holding time (1h-12h) of the formed phase structure has little effect, while the intensity of the fluorescence emission is very obvious that the high temperature Eu 2 O 3 reduction rate and solution related to the process; With Eu 2 doping concentration increased, CaSi 2 O 2 N 2 : Eu 2 launched fluorescence emission spectra redshift and concentration quenching effect, which is the Eu 2 < / sup> dipole interaction between the way energy transfer occurs due; in the UV - visible light (380-450nm) excitation, CaSi 2 O 2 N 2 : Eu 2 emits a yellow-green light, peak wavelength 530-550nm. 1400 ° C insulation 6h, Eu 2 ion doping concentration of 0.02 fluorescent material capable of GaN / InGaN blue LED (450nm) with the obtained 2-pcLED; N / O ratio increased CaSi2ON8 / 3 (δ = 1), the fluorescent material excitation - emission spectrum broadens, which is due to the lattice Eu 2 crystal field intensity around caused; treated with different concentrations of HF acid treatment, CaSi 2 O 2 N 2 : Eu 2 The morphology change, emission spectra are shifted to longer wavelengths; emission intensity change with HF concentration, using 4% HF treatment can improve the emission intensity of doubled. Ca1-x-2yEuxCeyLiySi2O2N2 fluorescent material is 330nm UV excitation and emission spectra showed Ce 3 and Eu 2 two emission peak emission wavelength peaks at ~ 400nm and ~ 550nm; x = 0.02, with the Ce 3 doping concentration increased, Eu 2 emission peak intensity increases; y = 0.01, with the Eu 2 < / sup> doping concentration x increases, Ce 3 emission intensity decrease is Ce 3 → Eu 2 caused by energy transfer; Ca1-xEuxCe0.01Li0.01Si2O2N2 phosphors excited by ultraviolet light, emit white light, the color coordinates (0.167,0.05) 0.349,0.521 . Implemented in a single white light emitting lattice, and with thermal and chemical stability, a white LED can be used in a fluorescent material.

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Solid nature of the > Optical Properties > Luminescence
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