近紫外白光LED用KBa_2(NbO_3)_5∶Eu^(3+)红色荧光粉的合成与发光性能  

Synthesis and Luminescence Properties of Red Phosphor KBa_2(NbO_3)_5∶ Eu^(3+) for Near-UV WLEDs

作　　者：李登宇[1] 王海波[2] 朱月华[2] 邢海东[2] 施丰华[2] 卓宁泽[2] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009 [2]南京工业大学电光源材料研究所,南京210015

出　　处：《人工晶体学报》2015年第7期1768-1772,共5页Journal of Synthetic Crystals

基　　金：国家重点基础研究发展计划(973)(2011CB200903);2014年科技部科研院所专项(2014EG111223);江苏省科技成果转化专项基金(BA2014073)

摘　　要：采用高温固相法制备了稀土离子Eu3+掺杂KBa2(Nb O3)5(KBN)新型红色荧光粉,用X射线衍射谱(XRD)、扫描电镜(SEM)、荧光光谱(PL)对其晶体结构和发光性能进行了表征。XRD表明KBa2(Nb O3)5的晶体结构没有随着Eu3+掺杂量的改变而改变,随着Eu3+掺杂量的增加,各衍射峰的位置向高衍射角偏移;SEM表明荧光粉样品晶体发育较好;荧光光谱表明Eu3+掺杂KBa2(Nb O3)5荧光粉在398 nm有最强激发峰,发射光谱的最强峰随Eu3+浓度增加从593 nm(5D0→7F1)变为613 nm(5D0→7F2)。当Eu3+的掺杂摩尔分数x在0.1~0.5范围内时,发光强度和红光色纯度随着Eu3+的浓度增加而增加,无浓度猝灭现象出现。Eu^3＋doped novel red-emitting phosphor KBa2 （NbO3 ）5 （KBN）were synthesized by high temperature solid-state reaction. The crystal structure and luminescence properties were characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）, photoluminescence （PL） spectrum. The crystal structure of KBa2 （NbO3 ）5 doesn＇t change with increasing concentration of Eu^3＋ doped in KBa2 （NbO3 ）5 from XRD patterns. SEM images show that crystal of phosphor samples are well- developed. Photoluminescence spectra show that it has a strongest excitation at 398 nm, and the strongest emission of the phosphor change from 593 nm （5D0→7Fl ） to 613 nm （5D0→7F2） with increasing concentration of Eu^3＋ doped in KBa2 （ NbO3 ） 5- When the mole fraction x of doped Eu3 ＋ is in the range of 0. 1-0.5, the luminescence intensity and red color purity of the phosphor increase gradually with the increase of Eu^3 ＋ concentration. It is found that no concentration auenching occurs.

关 键 词：高温固相法 近紫外 白光LED KBa2(Nb03)5:Eu^3+ 发光性能 

分 类 号：O482.31[理学—固体物理]