白光LED用Ba2LaF7: Pr3+微晶玻璃的发光性能研究

doi:10.15541/jim20160209

无机材料学报 ›› 2016, Vol. 31 ›› Issue (10): 1046-1050.DOI: 10.15541/jim20160209 CSTR: 32189.14.10.15541/jim20160209

白光LED用Ba₂LaF₇: Pr³⁺微晶玻璃的发光性能研究

张志雄, 欧阳绍业, 张约品, 夏海平

(宁波大学光电子功能材料实验室, 宁波 315211)

收稿日期:2016-03-30 修回日期:2016-06-01 出版日期:2016-10-20 网络出版日期:2016-09-23
作者简介:张志雄(1990–), 男, 硕士研究生. E-mail: yangtingting990622@163.com
基金资助:
国家自然科学基金(61275180, 51472125)

Enhanced Luminescent Properties of Pr³⁺ Doped Ba₂LaF₇ Glass Ceramics for White Light-emitting Diodes

ZHANG Zhi-Xiong, OUYANG Shao-Ye, ZHANG Yue-Pin, XIA Hai-Ping

(Key Laboratory of Photo-Electronic Material, Ningbo University, Ningbo 315211, China)

Received:2016-03-30 Revised:2016-06-01 Published:2016-10-20 Online:2016-09-23
About author:ZHANG Zhi-Xiong. E-mail: yangtingting990622@163.com
Supported by:
National Natural Science Foundation of China (61275180, 51472125)

摘要/Abstract

摘要：

采用高温熔制法制备得到50SiO₂-10AlF₃-5TiO₂-30BaF₂-4LaF₃-Pr₂O₃(mol%)基质玻璃, 玻璃样品分别经640℃、660℃和690℃热处理后, 成功获得透明Ba₂LaF₇: Pr³⁺微晶玻璃且维持着较高的透明度。用XRD和TEM分析热处理前后样品的相变和结构变化, 并研究了热处理前后样品的光谱特性。结果表明: 玻璃经热处理后生成了Ba₂LaF₇微晶颗粒; 热处理前后样品光谱特性的变化表明: 热处理后掺杂的Pr³⁺离子逐渐进入到Ba₂LaF₇晶格位; 在波长443 nm的激发下, 660℃热处理过的样品实现了白光输出, 对应的三色坐标为(0.323, 0.343)。

关键词: Ba₂LaF₇: Pr³⁺, 微晶玻璃, 发光性能

Abstract:

Pr³⁺-activated 50SiO₂-10AlF₃-5TiO₂-30BaF₂-4LaF₃glass were synthesized by a conventional melting technique, and then annealed at 640℃, 660℃ and 690℃, respectively. Transparent Ba₂LaF₇: Pr³⁺ glass ceramics were successfully prepared and the transparency still remained at a high level. X-ray diffraction and transmission electron microscope were used to monitor the evolution and microstructural changes after the glass specimens were annealed at temperature increasing from 640℃ to 690℃. The spectral properties of glass and glass ceramics were also investigated. Results show that Ba₂LaF₇ nanocrystals were precipitated in the teat-treated glasses and the measured luminescent properties indicate that Pr³⁺ions are gradually incorporated into the precipitated Ba₂LaF₇ crystalline phase. Under 443 nm excitation, the Commission Internationale de L’Eclairage (CIE) chromaticity coordinates for the glass ceramics heated at 660 ℃, were estimated to be (0.323, 0.343) and exactly located in the region of white light. Current findings reveal a fact that the prepared materials have potential as replacements of commonly employed phosphors applicating in white light-emitting diodes.

Key words: Ba₂LaF₇: Pr³⁺, glass ceramics, luminescent properties

中图分类号:

TQ174

张志雄, 欧阳绍业, 张约品, 夏海平. 白光LED用Ba₂LaF₇: Pr³⁺微晶玻璃的发光性能研究[J]. 无机材料学报, 2016, 31(10): 1046-1050.

ZHANG Zhi-Xiong, OUYANG Shao-Ye, ZHANG Yue-Pin, XIA Hai-Ping. Enhanced Luminescent Properties of Pr³⁺ Doped Ba₂LaF₇ Glass Ceramics for White Light-emitting Diodes[J]. Journal of Inorganic Materials, 2016, 31(10): 1046-1050.

图/表 7

图1 组分为50SiO2-10AlF3-5TiO2-30BaF2-4LaF3-Pr2O3(mol%)的样品DSC曲线

Fig. 1 DSC curve of as-prepared 50SiO2-10AlF3-5TiO2-30BaF2- 4LaF3-Pr2O3(mol%)

图2 玻璃和微晶玻璃样品的XRD图谱以及Ba2LaF7相标准卡片

Fig. 2 XRD patterns of samples PG, GC640, GC660, GC690 and the standard line graphs of Ba2LaF7 crystal (48-0099)

图3 玻璃以及微晶玻璃样品的透射光谱

Fig. 3 Transmission spectra of samples PG, GC640, GC660 and GC690

图4 样品的TEM照片以及SAED图像

Fig. 4 TEM image of GC660 and the corresponding SAED patterns

图5 玻璃及微晶玻璃样品的激发光谱

Fig. 5 Excitation spectra of samples PG, GC640, GC660 and GC690

图6 玻璃及微晶玻璃样品的发射光谱

Fig. 6 Emission spectra of PG, GC640, GC660 and GC690

图7 样品PG、GC660色度图(坐标点分别对应1, 2)

Fig.7 Chromaticity coordinates of samples PG, GC660 under 443 nm excitation (point 1, 2, respectively)

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白光LED用Ba₂LaF₇: Pr³⁺微晶玻璃的发光性能研究

Enhanced Luminescent Properties of Pr³⁺ Doped Ba₂LaF₇ Glass Ceramics for White Light-emitting Diodes

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