Photoluminescence, photochromism, and reversible luminescence modulation behavior of Sm-doped Na_0.5Bi_2.5Nb₂O₉ ferroelectrics

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• 作者：Qiwei Zhang^a ; Yao Zhang^a ; Haiqin Sun^a ; ^{a8082sz@imust.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Qi Sun^a ; Xusheng Wang^b ; Xihong Hao^a ; Shengli An^a
• 关键词：Photoswitching ; Photochromism ; Photoluminescence ; Ferroelectrics ; Luminescence modulation
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：37
• 期：3
• 页码：955-966
• 全文大小：4692 K

文摘

Sm-modified Na_0.5Bi_2.5Nb₂O₉ ceramics can simultaneously exhibit both visible light-driven photochromism and photoluminescence. Upon visible light irradiation, these materials change their color from green to dark gray, while exhibiting a strong red emission at 603 nm due to the ⁴G_5/2 → ⁶H_7/2 transition, whose emission intensity strongly depends on the irradiation wavelength, intensity, and time, and significantly decreases with increasing irradiation time and intensity. By alternating visible light or sunlight (λ > 400 nm) irradiation and thermal stimulus, both luminescence and absorption intensity can be reversibly switched without any significant degradation between the two colored and bleached states, with excellent reproducibility. On the basis of the trapped charge carrier and exponential relaxation decay models, we herein provide a detailed understanding of the photochromism and luminescence modulation mechanisms.