Full color white light, temperature self‐monitor, and thermochromatic effect of Cu+ and Tm3+ codoped germanate glasses. Issue 1 (6th October 2020)

• Record Type: Journal Article
• Authors: Zhang, Yuhang; Chen, Baojiu; Zhang, Xizhen; Li, Xiangping; Zhang, Jinsu; Xu, Sai; Wang, Xin; Zhang, Yanqiu; Wang, Li; Li, Desheng; Lin, Hai
• Is Part Of: Journal of the American Ceramic Society. Volume 104:Issue 1(2021)
• Page Start: 350
• Page End: 360
• Publication Date: 2020-10-06
• Subjects: Chroma‐tunable white light -- Cu+ -- full‐color emitting -- temperature self‐monitor -- thermochromatic performance -- Tm3+; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.17479
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: Lighting sources with full‐color visible output are widely preferred in practical applications. In addition, modern lighting sources also tend to be intelligentized, and the intelligentization asks for smart luminescence materials. In this work, we attempt to develop novel full‐color emitting material with temperature sensing and thermochromatic ability. To this end, the Cu 2+ is successfully reduced to Cu + which is incorporated into the germanate glasses. The glasses are prepared via a melt‐quenching technique using graphite powders as reducing reagent. The supper‐broadening of the excitation and the emission spectra of Cu + in the germanate glasses are observed. Full‐color emission is realized by introducing Tm 3+ as co‐dopant to provide the blue component in the spectra. The energy transfer behavior between Cu + and Tm 3+ is investigated, and it is found that these two luminescence centers are independently existent without energy transfer between them. The chromatic properties of the Cu + /Tm 3+ co‐doped glasses are tuned by Tm 3+ concentration and excitation wavelength. The temperature sensing based on the fluorescence intensity ratio technique is demonstrated, and a constant sensitivity for the temperature detection is obtained. Moreover the thermochromatic property is also investigated, and it is found that the studied Cu + /Tm 3+ ‐doped glasses exhibit excellent thermochromatic performance. Abstract : In Cu + and Tm 3+ codoped germanate glasses the tunable full color white light emissions were achieved by adjusting Tm 3+ concentration and excitation wavelengths. The optical temperature sensing based on the fluorescence intensity ratio was investigated, and constant sensitivity was examined. Moreover, it was also found that the studied glasses also exhibited excellent thermochromatic performance.