Preparation and Tunable Luminescence of Eu Doped KNN Ceramics  

作　　者：WANG Meng-Hui SHEN Hui TIAN Tian XIAN Qin XU Jia-Yue JIN Min JIA Run-Ping 

机构地区：[1]School of Materials Science and Engineering,Shanghai Institute of Technology,Shanghai 201418,China [2]State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China [3]School of Materials Science and Engineering,Shanghai Dianji University,Shanghai 201306,China

出　　处：《无机材料学报》2020年第2期236-242,共7页Journal of Inorganic Materials

基　　金：National Natural Science Foundation of China(61605116,51972213);Science and Technology Commission of Shanghai Municipality(15ZR1440600,15520503400)。

摘　　要：Rare-earth doped inorganic ferroelectrics are considered as novel photochromic materials,with potential applications for optical switch and information storage(K0.5Na0.5)1–xEuxNbO3(KNN:xEu)ceramics were prepared by high temperature calcination,with precursor powder obtained by hydrothermal method.Strong red emission at 615 nm was observed which corresponds to the 5D0→7F2 transition of Eu3+under excitation of 465 nm.Under UV light irradiation for 3 min,the color of the ceramics turned from milky white to dark gray.The colored samples returned to the original color when heated at 200℃for 10 min,showing strong photochromic behavior.Meanwhile,the luminescence intensity of Eu3+can be tuned without obvious degradation by alternating UV light and heat stimulus.Upon UV light irradiation,large luminescence modulation ratio(ΔRt)up to 83.9%was achieved for KNN:0.06Eu,indicating good luminescence switching behavior.A possible mechanism for non-radiative energy transfer from the luminescent center to the color center was proposed according to their luminescent behavior.

关 键 词：K0.5Na0.5NbO3(KNN) LUMINESCENCE PHOTOCHROMISM 

分 类 号：TQ174.75[化学工程—陶瓷工业]