Defects and solarization in YAG transparent ceramics  

作　　者：Le Zhang Jiadong Wu Petr Stepanov Micah Haseman Tianyuan Zhou David Winarski Pooneh Saadatkia Sahil Agarwal Farida A. Selim Hao Yang Qitu Zhang Yun Wang Chingping Wong Hao Chen 

机构地区：[1]Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China [2]Center for Photochemical Sciences, Department of Physics and Astronomy, Bowling Green State University, Bowling Green, Ohio 43403, USA [3]School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA [4]College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China [5]School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China

出　　处：《Photonics Research》2019年第5期549-557,共9页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(NSFC)(51402133,61603160,61775088);Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD);National Science Foundation(NSF)(DMR1359523);Key Research and Development Project of Jiangsu Province(BE2018062);Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX18_2096,KYCX18_2097,KYCX18_2098,KYCX18_2099)

摘　　要：Transparent ceramics are emerging as future materials for lasers, scintillation, and illumination. In this paper, an interesting and surprising phenomenon in YAG transparent ceramics is reported. UV light leads to significant changes in the microstructure of open volume defects and nano clusters as well as in the optical properties. Lightinduced lattice relaxation is suggested as the mechanism behind this intriguing behavior. The complex F-type color center with broad absorption bands is caused by the aliovalent sintering additives(Ca^2+∕Mg^2+) and Fe ion impurities. Two individual peaks in the thermoluminescence spectra illustrate both shallow and deep level traps.From positron annihilation lifetime data, vacancy clusters and nanovoids are detected and characterized, although these free-volume defects could not be observed by high-resolution transmission electron microscopy. The solarization induced by UV irradiation is associated with a change in the structure and size of defect clusters due to lattice relaxation. Therefore, this work shows how UV irradiation leads not only to a change in the charge state of defects, but also to a permanent change in defect structure and size. It significantly affects the optical properties of YAG ceramics and their performance in lasers and other optical applications. These results are crucial for advancing transparent ceramics technology.Transparent ceramics are emerging as future materials for lasers, scintillation, and illumination. In this paper, an interesting and surprising phenomenon in YAG transparent ceramics is reported. UV light leads to significant changes in the microstructure of open volume defects and nano clusters as well as in the optical properties. Lightinduced lattice relaxation is suggested as the mechanism behind this intriguing behavior. The complex F-type color center with broad absorption bands is caused by the aliovalent sintering additives(Ca2+∕Mg2+) and Fe ion impurities. Two individual peaks in the thermoluminescence spectra illustrate both shallow and deep level traps.From positron annihilation lifetime data, vacancy clusters and nanovoids are detected and characterized, although these free-volume defects could not be observed by high-resolution transmission electron microscopy. The solarization induced by UV irradiation is associated with a change in the structure and size of defect clusters due to lattice relaxation. Therefore, this work shows how UV irradiation leads not only to a change in the charge state of defects, but also to a permanent change in defect structure and size. It significantly affects the optical properties of YAG ceramics and their performance in lasers and other optical applications. These results are crucial for advancing transparent ceramics technology.

关 键 词：YAG FUTURE MATERIALS UV 

分 类 号：O4[理学—物理]