摘要
针对Mn^(2+)离子掺杂CsPbCl_(3)量子点中发光效率低且铅毒性问题,采用改进的热注入法制备了(Mn,Ce):CsPbCl_(3)量子点。利用Ce^(3+)离子4 f-5 d本征跃迁导致的主晶格到Mn^(2+)发射的能量转移,实现Mn^(2+)发射增强。研究表明,稀土离子Ce3+的引入有助于提高激子到Mn^(2+)的能量转移效率,从而提高量子点的光致发光量子效率。在PbCl_(2)∶MnCl_(2)∶CeCl_(3)进料比为1∶1∶0.5时,量子产率为19%,较纯CsPbCl_(3)量子点的发光效率提升了33倍。此外,制备了基于(Mn,Ce):CsPbCl_(3)量子点复合荧光粉的白光发光二极管,对其电致发光强度、显色指数(CRI)和色温随着驱动电流的变化做了一定的研究,当驱动电流为20 mA时,色温为3000 K,CRI为81.9.
Aiming at the problems of low luminous efficiency and lead toxicity in Mn^(2+)ion doped CsPbCl_(3)quantum dots,the(Mn,Ce)∶CsPbCl_(3)quantum dots were prepared by improved heat implantation method.The energy transfer from the main lattice to Mn^(2+)emission caused by the 4 f-5 d intrinsic transition of Ce^(3+)ions are used to enhance Mn^(2+)emission.The results show that the introduction of rare earth ion Ce^(3+)helps to improve the energy transfer efficiency from exciton to Mn^(2+),so as to improve the photoluminescence quantum efficiency of quantum dots.When the feed ratio of PbCl_(2)∶MnCl_(2)∶CeCl_(3)is 1∶1∶0.5,the quantum yield is 19%,which is 33 times higher than that of pure CsPbCl_(3)quantum dots.Moreover,a white light-emitting diode based on(Mn,Ce)∶CsPbCl_(3)quantum dot composite phosphors was prepared.The changes of electroluminescence intensity,color rendering index(CRI)and color temperature with driving current were studied.When the driving current was 20 mA,the color temperature was 3000 K,and the CRI was 81.9.
作者
张建峰
张瑞
刘海运
陈刚
吕泽华
张力夫
ZHANG Jian-feng;ZHANG Rui;LIU Hai-yun;CHEN Gang;LV Ze-hua;ZHANG Li-fu(School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《太原科技大学学报》
2024年第5期526-532,共7页
Journal of Taiyuan University of Science and Technology
基金
国家自然科学基金(11705124)
山西省应用基础研究计划面上项目(20210302123221)
山西省高等学校科技创新项目(2020L0335)
太原科技大学研究生优秀创新项目(XCX212106)。
关键词
钙钛矿量子点
锰铈共掺杂
常压
稀土
LED
perovskite quantum dots
Co-doped of manganese and cerium
ambient air
rear earth
LED
