CaMoO4：Eu3+红色荧光粉化学共沉淀合成与表征

doi:10.3724/SP.J.1077.2010.01015

无机材料学报 ›› 2010, Vol. 25 ›› Issue (10): 1015-1019.DOI: 10.3724/SP.J.1077.2010.01015 CSTR: 32189.14.SP.J.1077.2010.01015

CaMoO₄：Eu³⁺红色荧光粉化学共沉淀合成与表征

杨玉玲, 黎学明, 冯文林, 李武林, 陶传义

(重庆大学化学化工学院, 重庆400044)

收稿日期:2010-01-18 修回日期:2010-03-20 出版日期:2010-10-20 网络出版日期:2010-09-26
基金资助:
重庆市自然科学基金重点项目(2005BA4016); 重庆大学211工程创新人才培养计划建设项目(S-091013); 中国博士后基金(20100470810)

Synthesis and Characteristic of CaMoO₄：Eu³⁺ Red Phosphor for W-LED by Co-precipitation

YANG Yu-Ling, LI Xue-Ming, FENG Wen-Lin, LI Wu-Lin, TAO Chuan-Yi

(College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China)

Received:2010-01-18 Revised:2010-03-20 Published:2010-10-20 Online:2010-09-26
Supported by:
Nature Science Foundation of Chongqing Municipality(2005BA4016); Innovative Talent Training Project of the Third Stage of “211 Project”, Chongqing University (S-091013); National Science Foundation for Post-doctoral Scientists of China (20100470810)

摘要/Abstract

摘要： 以NH₄HCO₃-NH₃·H₂O为混合沉淀剂, 采用化学共沉淀法制备CaMoO₄：Eu³⁺红色荧光粉. 通过TG-DTA和XRD研究CaMoO₄：Eu³⁺前驱体的热分解和晶相形成过程; 采用SEM和PL表征了该荧光粉的表面形貌和发光性能, 并与NH₄HCO₃沉淀剂、NH₃·H₂O沉淀剂合成的CaMoO₄：Eu³⁺荧光粉以及高温固相法制备的荧光粉进行对比. 结果表明, 煅烧温度700℃时, 前驱体能够完全转换成单一CaMoO₄：Eu³⁺白钨矿结构; 煅烧温度900℃制备的荧光粉发光强度达到最大值; 采用混合沉淀剂制备的荧光粉大小均匀、无团聚、呈类球型, 平均粒径0.9μm. 与高温固相法比较, 其激发光谱中的Eu-O电荷迁移带向长波方向微小移动, 而⁷F₀→⁵L₆(394nm)和⁷F₀→⁵D₂(465nm)的强电子吸收能有效改善红色荧光粉使用性能; 与单独的NH₄HCO₃或NH₃·H₂O沉淀剂或高温固相法相比, 该荧光粉发光性能显著改善, 发光强度为传统固相法的2倍.

关键词: 共沉淀, CaMoO₄：Eu³⁺, 红色荧光粉

Abstract: Using NH₄HCO₃-NH₃·H₂O as a mixed precipitator, CaMoO₄：Eu³⁺ red phosphor was successfully synthesized by chemical co-precipitation method. The processes of thermal decomposition and phase formation for CaMoO₄：Eu³⁺ precursor were analyzed by TG-DTA and XRD. Compared with solid-state method, both surface morphology and luminescence properties of CaMoO₄：Eu³⁺ red phosphor using precipitators NH₄HCO₃, NH₃·H₂O and NH₄HCO₃-NH₃·H₂O are evaluated by means of SEM and PL respectively. After calcination at 700℃, the precursor is completely converted to a single scheelite structure of CaMoO₄：Eu³⁺. Photoluminescence intensity of the phosphor reaches the maximum value at 900℃. The phosphor prepared by using mixed precipitator is uniform spherical particle, and has no aggregation with average size of 0.9μm. Compared with solid-state method, the Eu-O CTS of the red phosphor slightly shifts toward long wavelength. The strong electron absorbability of ⁷F₀→⁵L₆ (394nm) and ⁷F₀→⁵D₂ (465nm) effectively improves the performance of red phosphor. In addition, the photoluminescent intensity from the mixed precipitation is increased to 2 times of that of the red phosphors prepared by solid-state method.

Key words: co-precipitation, CaMoO₄：Eu³⁺, red phosphor

中图分类号:

TQ174

杨玉玲, 黎学明, 冯文林, 李武林, 陶传义. CaMoO₄：Eu³⁺红色荧光粉化学共沉淀合成与表征[J]. 无机材料学报, 2010, 25(10): 1015-1019.

YANG Yu-Ling, LI Xue-Ming, FENG Wen-Lin, LI Wu-Lin, TAO Chuan-Yi. Synthesis and Characteristic of CaMoO₄：Eu³⁺ Red Phosphor for W-LED by Co-precipitation[J]. Journal of Inorganic Materials, 2010, 25(10): 1015-1019.

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CaMoO₄：Eu³⁺红色荧光粉化学共沉淀合成与表征

Synthesis and Characteristic of CaMoO₄：Eu³⁺ Red Phosphor for W-LED by Co-precipitation

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