Dual-mode luminescence and light intensity modulation of Ho3+and Yb3+doped calcium stannate ceramics
Rare earth ion-doped inorganic photochromic materials can be applied in the field of optical informa-tion storage by coupling photochromism with photoluminescence intensity modulation.The development of ma-terials with dual-mode luminescence modulation properties using a multiphoton absorption strategy is an effec-tive means to enhance the lifetime of optical information storage.In this study,ceramics with dual-mode lumi-nescence and light intensity modulation properties were prepared by selecting Ho3+and Yb3+co-doping with calcium stannate as the host.The ceramic produces intense green and red emission in the visible region under 461 nm blue light excitation.Under the excitation of 980 nm near-infrared light,the ceramics appear three visi-ble emission bands centered at 551 nm,669 nm and 756 nm.The mechanism of up-conversion luminescence is discussed,and the results show that ceramic up-conversion luminescence is related to the two-photon process.365 nm UV light irradiation of ceramic up-conversion and down-conversion luminescence intensity of attenuation modulation phenomenon,the green luminescence modulation effect is better than the red.Information on the distribution and depth of traps inside the ceramics was obtained by thermoluminescence spectroscopy tests,pro-ving the existence of carrier traps.The results of fluorescence lifetime tests and luminescence kinetics tests be-fore and after UV irradiation showed that the light intensity decay was related to the energy transfer from the luminescence center to the trap center.
optical information storagedown-conversion luminescenceup-conversion luminescencelight intensity modulation
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