Publication: Kinetic study of the thermal quenching of the ultraviolet emission in Zn_2GeO_4 microrods
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2022
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Wiley-V C H VERLAG GMBH
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Abstract
Zn_2GeO_4 microrods obtained by thermal evaporation of a compacted powder mixture of ZnO and Ge exhibit quite intense UV luminescence at low temperatures. Herein, the luminescence properties of Zn_2GeO_4 microrods are studied for 2:1 and 1:1 ZnO:Ge ratio in the precursor mixture. In both cases, Zn2GeO4 microrods of high crystal quality produce a 355 nm emission under aforementioned bandgap excitation conditions at low temperatures. However, this emission vanishes at room temperature (RT) in the 1:1 samples while it is kept in the 2:1 ones. Herein this work, the thermal quenching of the UV luminescence is studied by means of steady and time-resolved photoluminescence techniques from 4 K up to RT for both Zn_2GeO_4 microrods. The analysis of the results leads us to conclude that although the luminescence mechanisms are the same in both cases, a higher decay rate is observed in the 1:1 in both intensity and lifetime, which explain the observed thermal quenching at RT.
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CRUE-CSIC (Acuerdos Transformativos 2022)
©2022 WILEY-V C H VERLAG GMBH
This work has been supported by MINECO projects M-ERA.NET PCIN-2017-106 and MICINN project (RTI2018-097195-B-I00). We thank the CAI (UCM) for XRD facilities.