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oai:docta.ucm.es:20.500.14352/714032024-08-29T16:08:46Zcom_20.500.14352_14col_20.500.14352_15

Dolado Fernández, Jaime Hidalgo Alcalde, Pedro Méndez Martín, María Bianchi 2023-06-22T10:41:39Z 2023-06-22T10:41:39Z 2022 1862-6254 10.1002/pssr.202100613 https://hdl.handle.net/20.500.14352/71403 http://dx.doi.org/10.1002/pssr.202100613 https://onlinelibrary.wiley.com/ 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. eng https://creativecommons.org/licenses/by-nc-nd/3.0/es/ open access Atribución-NoComercial-SinDerivadas 3.0 España Kinetic study of the thermal quenching of the ultraviolet emission in Zn_2GeO_4 microrods journal article