Reversible Luminescence Modulation upon Photochromic Reactions in Rare-Earth Doped Ferroelectric Oxides by in Situ Photoluminescence Spectroscopy.
Reversible luminescence photoswitching upon photochromic reactions with excellent reproducibility is achieved in a new inorganic luminescence material: Na(0.5)Bi(2.5)Nb2O9: Pr(3+) (NBN:Pr) ferroelectric oxides. Upon blue light (452 nm) or sunlight irradiation, the material exhibits a reversible photochromism (PC) performance between dark gray and green color by alternating visible light and thermal stimulus without inducing any structure changes and is accompanied by a red emission at 613 nm. The coloration and decoloration process can be quantitatively evaluated by in situ photoluminescence spectroscopy. Meanwhile, the luminescence emission intensity based on PC reactions is effectively tuned by changing irradiation time and excitation wavelength, and the degree of luminescence modulation has no significant degradation after several periods, showing very excellent reproducibility. On the basis of the luminescence modulation behavior, a double-exponential relaxation model is proposed, and a combined equation is adopted to well describe the luminescence response to light irradiation, being in agreement with the experimental data.
School of Materials and Metallurgy, Inner Mongolia University of Science and Technology , 7# Arerding Street, Kun District, Baotou 014010, China.
Qiwei
Q
Zhang
School of Materials and Metallurgy, Inner Mongolia University of Science and Technology , 7# Arerding Street, Kun District, Baotou 014010, China.
Haiqin
H
Sun
Functional Materials Research Laboratory, School of Materials Science and Engineering, Tongji University , 4800 Caoyang Road, Shanghai 201804, China.
Xusheng
X
Wang
School of Materials and Metallurgy, Inner Mongolia University of Science and Technology , 7# Arerding Street, Kun District, Baotou 014010, China.
Xihong
X
Hao
School of Materials and Metallurgy, Inner Mongolia University of Science and Technology , 7# Arerding Street, Kun District, Baotou 014010, China.
Shengli
S
An
ferroelectric oxides; luminescence modulation; photochromism; reproducibility; sunlight irradiation