白光LED用Ce∶YAG单晶的光学性能与掺杂浓度分析

doi:10.7503/cjcu20130512

高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (2): 230.doi: 10.7503/cjcu20130512

• 研究论文: 无机化学 • 上一篇下一篇

白光LED用Ce∶YAG单晶的光学性能与掺杂浓度分析

赵斌宇¹, 梁晓娟²(), 陈兆平², 谢翠萍¹, 骆乐¹, 张志敏², 钟家松¹, 向卫东²()

1. 同济大学材料工程与科学学院, 上海 200092
2. 温州大学化学与材料工程学院, 温州 325035

收稿日期:2013-05-30 出版日期:2014-02-10 发布日期:2013-09-13
作者简介:联系人简介: 梁晓娟, 女, 研究员, 主要从事无机材料研究. E-mail:lxj6126@126.com; 向卫东, 男, 博士, 教授, 博士生导师, 主要从事LED相关光电材料的制备和研究. E-mail:xiangweidong001@126.com
基金资助:
国家自然科学基金(批准号: 51172165)、浙江省自然科学基金重点项目(批准号: Z4110347)、浙江省重大科技专项重大工业项目(批准号: 2012C01028-2)和湖州市自然科学基金(批准号: 2011YZ02)资助

Studies on Optical Properties and Ce Concentration of Ce∶YAG Single Crystal for WLEDs^†

ZHAO Binyu¹, LIANG Xiaojuan^2,^*(), CHEN Zhaoping², XIE Cuiping¹, LUO Le¹, ZHANG Zhimin², ZHONG Jiasong¹, XIANG Weidong^2,^*()

1. College of Materials Science and Engineering, Tongji University, Shanghai 200092, China
2. College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China

Received:2013-05-30 Online:2014-02-10 Published:2013-09-13
Contact: LIANG Xiaojuan,XIANG Weidong E-mail:lxj6126@126.com;xiangweidong001@126.com
Supported by:
† Supported by the National Natural Science Foundation of China(No.51172165), the Zhejiang Province Natural Science Foundation, China(No.24110347), the Zhejiang Province Major Technology and Industrial Program, China(No.2012C01028-2) and the Hazhou Natural Science Foundation, China(No.2011Y202)

摘要/Abstract

摘要：

采用提拉法生长Ce∶YAG单晶, 通过X射线衍射和激发发射光谱对其晶相结构和光谱特性进行了表征, 研究了Ce∶YAG单晶封装白光LED的最佳掺杂浓度. 在455 nm蓝光激发下, Ce∶YAG单晶的发射光谱可由中心波长526 nm(5d¹²E_gГ₈_g→4f¹²F_7/2Г₈_u)的宽发射带(500~650 nm)组成; 激发光谱由343 nm(4f¹²F_5/2Г₇_u→5d^{1 2}E_gГ₇_g)和466 nm(4f¹²F_5/2Г₇_u→5d^{1 2}E_gГ₈_g)2个激发峰组成; Stokes位移为2448 cm^-1, Huang-Rhys因子为6.12. 研究结果表明, Ce∶YAG单晶中Ce离子掺杂浓度与封装的白光LED之间有对应关系, 在650 nm红粉调节下Ce离子最佳掺杂浓度范围为0.034~0.066.

关键词: 白光LED, 铈掺杂钇铝石榴石, 光学性能, 掺杂浓度

Abstract:

Ce∶YAG single crystal for white light emitting diode(WLED) was grown by Czochralski method. The structure and optical properties of samples were characterized by X-ray diffraction(XRD) and photoluminescence spectra. Ce∶YAG single crystal shows a 500—650 nm broad emission band around 526 nm(5d^{1 2}E_gГ₈_g→4f^{1 2}F_7/2Г₈_u) under blue light of 455 nm. The excitation spectrum of Ce∶YAG single crystal is made up of 343 nm(4f^{1 2}F_5/2Г₇_u→5d^{1 2}E_gГ₇_g) and 466 nm(4f^{1 2}F_5/2Г₇_u→5d^{1 2}E_gГ₈_g) excitation peaks. The Stokes shift is 2448 cm^-1. The Huang-Rhys parameter is 6.12. The Ce concentration of Ce∶YAG single crystal is related with colour coordinate of WLEDs made by Ce∶YAG single crystal with the red phosphor(650 nm), a best concentration range of Ce in Ce∶YAG single crystal is 0.034—0.066.

Key words: White LED, Yttrium aluminum garnet doped with cerium, Optical property, Doping concentration

中图分类号:

TrendMD:

赵斌宇, 梁晓娟, 陈兆平, 谢翠萍, 骆乐, 张志敏, 钟家松, 向卫东. 白光LED用Ce∶YAG单晶的光学性能与掺杂浓度分析. 高等学校化学学报, 2014, 35(2): 230.

ZHAO Binyu, LIANG Xiaojuan, CHEN Zhaoping, XIE Cuiping, LUO Le, ZHANG Zhimin, ZHONG Jiasong, XIANG Weidong. Studies on Optical Properties and Ce Concentration of Ce∶YAG Single Crystal for WLEDs^†. Chem. J. Chinese Universities, 2014, 35(2): 230.

图/表 6

Fig.1 Package process of Ce∶YAG single crystal for WLEDs(A) and an artifact of Ce∶YAG single crystal for WLEDs(B)

Fig.2 XRD patterns of Ce∶YAG single crystal(A) Powder; (B) plate.

Fig.3 Excitation(a, c) and emission(b,d) spectra of Ce∶YAG single crystal(a,b) and Ce∶YAG powder(c,d)

Fig.4 Energy level and band structure of the 4f 1 and 5d1 configurations of the Ce3+ ion in a Ce∶YAG single crystal field(Distorted cube)[2,34,35]

Fig.5 Relationship between colour coordinates x and y(A) and the fitting curve about the relationship between cerium concentration of Ce∶YAG single crystal and colour coordinate of WLED made by Ce∶YAG single crystal(B)l1: Relationship between x and y, which represent of WLEDs made by Ce∶YAG single crystal; l2: the line of black-body radiation; l3, l4: changes of colour coordinates under the help of red phosphor(650 nm); A: a colour coordinate of WLEDs made by Ce∶YAG single crystal locates at the line of black-body radiation; B: the colour coordinate of commercial red phosphor(650 nm); CDEF: the qualified range of commercial WLEDs; H→G: colour coordinates used as WLEDs with of Ce∶YAG single crystal a best cerium concentration range

Table 1 Colour coordinates of Ce∶YAG single crystal with cerium concentration changes

Cerium concentration	Colour coordinate
0.030	(0.2649, 0.2609)
0.036	(0.3133, 0.3741)
0.040	(0.3362, 0.4113)
0.060	(0.3506, 0.4437)
0.100	(0.3988, 0.4972)
0.120	(0.4007, 0.5300)
0.140	(0.4121, 0.5447)

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白光LED用Ce∶YAG单晶的光学性能与掺杂浓度分析

Studies on Optical Properties and Ce Concentration of Ce∶YAG Single Crystal for WLEDs^†

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白光LED用Ce∶YAG单晶的光学性能与掺杂浓度分析

Studies on Optical Properties and Ce Concentration of Ce∶YAG Single Crystal for WLEDs†

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Studies on Optical Properties and Ce Concentration of Ce∶YAG Single Crystal for WLEDs^†