无机材料学报2020，Vol.35Issue(2)：236-242,7.DOI:10.15541/jim20190106
Eu掺杂KNN陶瓷的制备及可调性发光研究
Preparation and Tunable Luminescence of Eu Doped KNN Ceramics
摘要
Abstract
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 (ARt) 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)/发光/光致变色Key words
K0.5Na0.5NbO3(KNN)/luminescence/photochromism分类
化学化工引用本文复制引用
王梦慧,申慧,田甜,鲜琴,徐家跃,金敏,贾润萍..Eu掺杂KNN陶瓷的制备及可调性发光研究[J].无机材料学报,2020,35(2):236-242,7.基金项目
National Natural Science Foundation of China (61605116,51972213) （61605116,51972213）
Science and Technology Commission of Shanghai Municipality (15ZR1440600,15520503400) （15ZR1440600,15520503400）
