Enhancement of red emission assigned to inversion defects in ZnAl2O4:Cr3+ hollow spheres  

作　　者：Dong Zhang Jingxin Chen Chunyu Du Bingjun Zhu Qingru Wang Qiang Shi Shouxin Cui Wenjun Wang 

机构地区：[1]School of Physical Science and Information Technology,Shandong Key Laboratory of Optical Communication Science and Technology,Liaocheng University,Liaocheng,252059,China

出　　处：《Frontiers of Materials Science》2020年第1期73-80,共8页材料学前沿（英文版）

基　　金：This work was supported by the Initial Foundation for the Doctor Project of Liaocheng University (No. 318051410);the Project of Science and Technology Plan for University of Shandong Province (No. J16LJ05);the National Natural Science Foundation of China (Grant Nos. 61574071, 61775089, 11604132 and 11604133);the Shandong Province Natural Science Foundation of China (Nos. ZR2018MA036 and ZR2018MA039);the Industrial Alliance Fund of Shandong Provincial Key Laboratory (Grant No. SDKL2016038);the ‘Taishan Scholars’ Construction Special Fund of Shandong Province.

摘　　要：ZnAl2O4:Cr3+hollow spheres composed of secondary nanoparticles with single spinel phase were fabricated using carbon templets.Monitoring the emission of 687 nm,two wide excitation bands attributed to the electrons of Cr3+transiting from 4A2g(4F)→4T1g(4F)and 4A2g(4F)→4T2g(4F)were observed.The broad excitation band at about 397 nm was asymmetric and consisted of two peaks,indicating that there was a trigonal distortion existing in the lattices.The intensity of all emitting peaks revealed sharp increasing trend with the sintering temperature increase,and the intensity of emission at 698 nm assigned to inversion defects was more intense than that of emission at 687 nm assigned to octahedral Cr3+ions in the undistorted spinel lattice.The samples with higher synthesized temperature revealed longer decay time,and the relative weightage of shorter decay time component decreased with the increase of sintering temperature,indicating that the surface defects decreased.

关 键 词：semiconductors HOLLOW SPHERE INVERSION DEFECTS photoluminescence 

分 类 号：O57[理学—粒子物理与原子核物理]