自激活LiSr_(2)Ca_(2)(BN_(2))_(3)荧光粉的合成与发光性能  

Synthesis and Luminescent Properties of Self-activated LiSr_(2)Ca_(2)(BN_(2))_(3) Phosphor

作　　者：王新然 王凤翔 廖雨 马一智 张钰 王凯旋 周雪莲 朝克夫[1,2,3] 那日苏 WANG Xin-ran;WANG Feng-xiang;LIAO Yu;MA Yi-zhi;ZHANG Yu;WANG Kai-xuan;ZHOU Xue-lian;CHAO Ke-fu;NA Ri-su(School of Physics and Electronic Information,Inner Mongolia Normal University,Hohhot 010022,China;Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials,Inner Mongolia Normal University,Hohhot 010022,China;Inner Mongolia Engineering Research Center of New Energy Storage Materials,Inner Mongolia,Hohhot 010022,China)

机构地区：[1]内蒙古师范大学物理与电子信息学院,内蒙古呼和浩特010022 [2]内蒙古师范大学内蒙古自治区功能材料物理与化学重点实验室,内蒙古呼和浩特010022 [3]内蒙古自治区新能源储能材料工程研究中心,内蒙古呼和浩特010022

出　　处：《发光学报》2022年第8期1227-1235,共9页Chinese Journal of Luminescence

基　　金：国家自然科学基金(12164034);内蒙古自然科学基金(2019MS05030);内蒙古科技计划(2019GG263);内蒙古自治区研究生教育创新计划(SZ2020115);内蒙古师范大学研究生科研创新基金(CXJJS20096)资助项目。

摘　　要：自激活发光受到了研究人员的广泛关注,其中硼氮化物缺陷发光材料因毒性低、合成简单、结构多样性等优点,具有成为新一代LED用荧光粉的潜力,但是低热稳定性限制了其实际应用。本文采用高温固相一步法,通过部分取代LiSr_(4)(BN_(2))_(3)(LSBN)中的Sr,合成了一种新的LiSr_(2)Ca_(2)(BN_(2))_(3)(LSCBN)发光材料。采用X射线衍射仪、扫描电子显微镜和荧光光谱仪对荧光粉的相组成、形貌和光学性质进行了表征。结果表明,所制备的样品LSBN为立方晶系,空间群Im-3m。在紫外区域有较宽的激发带,发射光谱峰值位于561 nm,半峰宽度(FWHM)约为4504cm^(-1)。LSCBN的发光强度是LSBN的的2倍。解释了LSCBN的发光机理,LSCBN荧光粉中存在替代式缺陷,在光激励下形成发光中心。变温光谱显示,150℃时,LSBN的发光强度为初始强度的17%,LSCBN的发光强度为初始强度的57%,超过了已报道的其他硼氮化物荧光粉。这种离子取代的方法能有效调控发光波长和增强荧光强度,改善热稳定性,为硼氮化物缺陷材料发光性能的改善提供了新的思路和应用前景。Self-activated phosphors have received a lot of attention from researchers,among which nitridoborate defect phosphors have the potential to become a new generation of phosphors for LEDs due to low toxicity,simple synthesis,and structural diversity,but low thermal stability limits their practical applications.In this paper,a new LiSr_(2)Ca_(2)(BN_(2))_(3)(LSCBN)phosphor was synthesized by partially replacing Sr in LiSr_(4)(BN_(2))_(3)(LSBN)using a high-temperature solid-phase one-step method.The phase composition,morphology,and optical properties of the phosphor were characterized by Xray diffraction,scanning electron microscopy,and fluorescence spectrometry.The results show that the prepared sample LSBN is a cubic crystal system with the space group Im⁃3m.It has a wide exci‑tation band in the UV region,the peak of the emission spectrum is located at 561 nm,and the full width at half maximum(FWHM)is about 4504 cm^(-1).The luminescence intensity of a LSCBN is twice that of a LSBN.In LSCBN,the partial replacement of Sr by Ca introduces substitutional de‑fects that form new luminescence centers.In the temperature dependence PL spectra,the intensity of LSBN at 150℃is 17%of the initial value,and LSCBN can maintain 57%of the initial intensity at 150℃,which exceeds other nitridoborate phosphors that have been reported.This ion-substitu‑tion method can effectively regulate the luminescence wavelength and enhance the luminous intensi‑ty,improve the thermal stability,and provide a new idea and application prospect for the improve‑ment of the luminescence performance of defect-related nitridoborate phosphors.

关 键 词：硼氮化物 缺陷发光材料 阳离子取代 发光机理 

分 类 号：O482.31[理学—固体物理]