高色纯度白光LED用蓝光材料Gd2MgTiO6∶Bi^3+的合成及性能  

High Color Purity Blue Emitting Phosphors Gd2MgTiO6∶Bi^3+for White Light Emitting Diodes:Synthesis and Luminescence Properties

作　　者：汲长艳 肖双燕 黄中胜 黄志 文瑾 彭秧锡 JI Chang-yan;XIAO Shuang-yan;HUANG Zhong-sheng;HUANG Zhi;WEN Jin;PENG Yang-xi(Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi 417000, China;National Electronic Ceramics Product Quality Supervision and Inspection Center(Hunan), Loudi 417000, China)

机构地区：[1]湖南人文科技学院材料与环境工程学院,精细陶瓷与粉体材料湖南省重点实验室,湖南娄底417000 [2]国家电子陶瓷产品质量监督检验中心(湖南),湖南娄底417000

出　　处：《发光学报》2020年第5期529-535,共7页Chinese Journal of Luminescence

基　　金：湖南省教育厅优秀青年基金(18B450);精细陶瓷与粉体材料湖南省重点实验室开放基金(TC201704);湖南省自然科学基金(2019JJ50282);湖南省科技计划(2016TP1028);湖南省“双一流”应用特色学科(湘教通[2018]469号)资助项目。

摘　　要：采用高温固相法合成了一系列蓝光荧光粉Gd2-xMgTiO6∶xBi3+(0.0025≤x≤0.015),并对样品的表面形貌、晶体结构、发光性能和热稳定性进行了探究。SEM测试结果显示,样品Gd2MgTiO6∶Bi3+的粒径分布范围大,颗粒尺寸在1~5μm范围。XRD测试表明,Bi3+成功掺杂进入基质Gd2MgTiO6中且无杂相产生。荧光光谱测试结果表明,在375 nm波长激发下,蓝光荧光粉Gd2MgTiO6∶Bi3+于385~500 nm波长范围内呈现出属于Bi3+的1S0→3P1能级跃迁的窄带发射峰,且发射强度最大处位于418 nm,这有利于避免光的重吸收现象。不同掺杂浓度下样品的发射光谱研究表明,最佳Bi3+掺杂浓度为x=0.0075。此外,发光强度最佳的蓝光样品Gd1.9925MgTiO6∶0.0075Bi3+的CIE坐标为(0.1629,0.0364),位于蓝光区域,色纯度高达96.42%,平均荧光寿命高达11.29 ms。样品的热稳定性高于文献报道的同类样品。这些均说明该样品是一种发光性能和热稳定性能良好的W-LEDs用蓝光组分。A series of blue-emitting phosphors Gd2-xMgTiO6∶xBi3+(0.0025≤x≤0.015)were synthesized by high-temperature solid state method,and the corresponding morphology,crystal structure,photoluminescence properties and thermal stability were investigated.The scan electron microscope(SEM)test predicted that the samples Gd2MgTiO6∶Bi3+possessed a large particle size distribution with the particle size ranging from 1μm to 5μm.The X-ray diffraction(XRD)analysis showed that the Bi3+ions successfully doped into host lattice Gd2MgTiO6 with no other impurity phase existed.The photoluminescence properties stated that the blue emitting phosphors Gd2MgTiO6∶Bi3+presented a single narrow emission peak located at about 418 nm assigned to the 1S0→3P1 transition in the range from 385 nm to 500 nm in the excitation of 375 nm,which helped to avoid light reabsorption.Moreover,when the doping concentration of Bi3+ions is 0.0075,the emission intensity reaches the maximum.The sample Gd1.9925MgTiO6∶0.0075Bi3+with best photoluminescence properties exhibited a Commission Internationale De I'eclairage(CIE)coordinates of(0.1629,0.0364)in blue-light area with an impressive color purity up to 96.42%and an impressive average lifetime of 11.29 ms.In addition,the thermal stability of sample Gd1.9925MgTiO6∶0.0075Bi3+was relatively higher than that of similar blue-emitting phosphors in the literature.These results indicated that sample Gd1.9925MgTiO6∶0.0075Bi3+is a kind of blue-emitting component for W-LEDs with excellent luminescence and thermal stability.

关 键 词：W-LEDs 高色纯度 Gd2MgTiO6∶Bi 蓝光荧光粉 

分 类 号：TQ174[化学工程—陶瓷工业]