Yuzhen Wang,Yanan Wang,Chaoyang Ma,Yanbin Li,Chong Zhao,Wanggui Ye,Zicheng Wen,Xuanyi Yuan,Yongge Cao
Bifunctional luminescence materials have aroused considerable concern due to their wide application and high utilization. In this study, we have successfully integrated bright green up-conversion luminescence of K0.5Bi0.5TiO3 (KBT): Er/In ceramics with potential applications on cryogenic optical thermometry and photomemory. By employing the fluorescence intensity ratio based on thermally coupled levels of Er3+: 2H11/2/4S3/2, the splendid low-temperature sensing properties were demonstrated as the maximum relative sensitivities were 7.14% K−1 and 8.73% K−1 at 137 K for KBT: Er and KBT: Er/In ceramics, respectively. Moreover, the reversible photochromism performance could be triggered by the 365 nm irradiation and vanished by thermal stimulation at 150 °C. Remarkably, the coupling of up-conversion luminescence and photochromism performance has a promising application on rewritable photomemory. For the KBT: Er/In ceramic, the emission intensity could be reduced by 76.59% after coloration, and restored to its original value after bleaching. In order to evaluate the practicability of applying on photomemory, a reversible experiment was designed and successfully executed. It is believed that the KBT: Er/In bifunctional ceramic can be a great candidate for low-temperature sensing and optical information storage devices.
Jingheng Nie,Weitao Ying,Xuemei Fan,Shiqing Xu,Zhenhua Gao,Jianmin Gu,Shimin Liu
Rational design of multicolor upconversion (UC) luminescent to achieve cryogenic optical thermometers holds exotic potential applications in many high-tech fields. Here, a strategy is proposed to design multicolor UC luminescence by thermally manipulating the electronic transition process, which could be used to achieve optical temperature sensing. The nonthermally coupled energy levels could control the emission intensity of the corresponding energy levels through the nonradiative relaxation process, thus allowing for achieving high sensitivity cryogenic sensing. The Er3+-doped material exhibited thermochromic luminescence properties due to the unique thermal response mechanism, which enables the creation of novel multimode temperature measurements of visual reading and digital recognition. These results not only shed new insights on the luminescence mechanism under specific excitation conditions but also offer a novel strategy for the realization of cryogenic optical thermometers.
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