Synthesis of agglomerate-free YAG: Ce3+ phosphors by co-precipitation and low temperature spray pyrolysis

2011 International Symposium on Advanced Packaging Materials (APM) Pub Date : 2011-12-19 DOI:10.1109/ISAPM.2011.6105683

S. Gao, Yibin Chen, Renjie Zeng

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引用次数: 2

Abstract

Y3−xCexAl5O12 (YAG: Ce³⁺) phosphor particles were prepared by a new method called co-precipitation and low temperature spray pyrolysis (CP-LTSP) with oxalic acid and ammonia as precipitant. It corresponds to the first-step chemical liquid reaction, the second step dehydration and partial decomposition of precipitation droplets at 250°C and then heating at 1100°C or above. Spherical as-prepared particles and agglomerate-free YAG: Ce³⁺ phosphor particles were obtained respectively. Pure YAG phase could be formed after LTSP at 250°C and then annealing at 1100°C for 4 h. The emission spectra and XRD patterns of YAG: Ce³⁺ phosphor particles indicated that the optimum doping concentration of Ce³⁺ was 0.06. The emission intensity increased with the increase of annealing temperature. As a result, the YAG: Ce³⁺ phosphor particles without optimization annealed at 1550°C for 4 h had the similar emission intensity (96%) of the commercial phosphor by the solid-state method.

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共沉淀法和低温喷雾热解法制备无团块YAG: Ce3+荧光粉

以草酸和氨为沉淀剂，采用共沉淀-低温喷雾热解(CP-LTSP)法制备了Y3−xCexAl5O12 (YAG: Ce3+)荧光粉颗粒。对应第一步化学液体反应，第二步250℃脱水部分分解沉淀液滴，然后1100℃以上加热。制备的YAG: Ce3+荧光粉颗粒分别为球形和无团聚体。经250℃LTSP, 1100℃退火4 h，可以形成纯净的YAG相。YAG: Ce3+荧光粒子的发射光谱和XRD分析表明，Ce3+的最佳掺杂浓度为0.06。发射强度随退火温度的升高而增大。结果表明，未经优化的YAG: Ce3+荧光粉颗粒在1550℃下退火4 h后，其发射强度(96%)与固态法制备的商用荧光粉相似。

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2011 International Symposium on Advanced Packaging Materials (APM)

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