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Photochromic (PC) materials can be widely applied in light‐driven devices such as optical antifake labels, optical switches, information storage. Herein, Er3+ and Pr3+ co‐doped Na0.5+xBi2.5+xNb2O9 (x = −0.02, 0, 0.02) ferroelectric ceramics with excellent PC and luminescence modulation properties have been successfully prepared. Both chemical and physical strategies, namely excess Na+ and Bi3+ content...
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