Tunable upconversion luminescence in new Ho³⁺/Yb³⁺‐doped SrBi₄Ti₄O₁₅ photochromic ceramics for switching application

Abstract

Upconversion (UC) luminescence modulation is quite important in controlling and processing light for active components of light sources, photoswitches, optical memories, and optical sensing devices. In this work, we reported one kind of novel phosphor, Ho3+/Yb3+‐doped SrBi4Ti4O15 ceramics, which displayed both strong UC luminescence and obvious photochromic (PC) reaction. The UC luminescence, PC effect, and the modulation of UC performance based on PC behavior were investigated in detail. By alternating visible light irradiation and thermal stimulus, the UC luminescence could be reversibly regulated. Meanwhile, the modulation was unveiled to tightly rely on the irradiation time and thermal treatment processes. Excellent reproducibility was also achieved. In addition, as an alternative method to thermal treatment, the manipulation of luminescence by electric field was also explored. Finally, the mechanism related to the UC luminescence manipulation was illustrated. The results indicate that these samples could be potentially utilized in optical data storage and anti‐counterfeiting security fields.

Realizing nondestructive luminescence readout in photochromic ceramics via deep ultraviolet excitation for optical information storage

“…[8][9][10][11][12] Although most reported photochromic materials are organic compounds by far, inorganic photochromic materials possess some inherent advantages over the organic-based materials in the aspects of thermal stability, chemical resistance and fatigue properties, and hence have attracted more attention in recent years. [13][14][15][16][17][18][19][20][21] Currently, the research on inorganic photochromic materials mainly focuses on transition metal oxides (WO3, MoO3, TiO2, Nb2O5 and V2O5), [22][23][24][25][26][27] ferroelectrics (Na0.5Bi4.5Ti4O15, Na0.5Bi2.5Nb2O9, Bi4Ti3O12, KSr2Nb5O15, SrBi2Nb2O9 and K0.5Na0.5NbO3), 10,11,18,20,21,[28][29][30][31][32][33][34][35][36][37] and other robust oxides (BaMgSiO4, Sr2SnO4 and (Ca,Sr,Ba)5(PO4)3F). [38][39][40][41][42][43][44] For these materials, light-induced changes in physical properties such as refractive index, electron conductivity, magnetic properties, refractive index or absorption spectrum can be regarded as the digital code of "0" and "1", respectively.…”

Realization of multiple luminescence manipulation in tungsten bronze oxides based on photochromism toward real-time, reversible, and fast processes

“…It is known that the interaction between light and matter plays an important role in the fields of spectroscopy, sensing, quantum information processing, and lasers. [21][22][23][24][25] Among the photophysical phenomena, photochromism is an emblematic phenomenon, [26][27][28][29][30][31][32][33][34][35][36][37] which involves the migration and capture of photogenerated electrons and holes, and the formation of color centers. Color centers determine the characteristic absorption, and control the position and amplitude of the absorption peaks.…”