2026-06-07T19:38:41Zhttps://docta.ucm.es/rest/oai/request

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

Kinetic study of the thermal quenching of the ultraviolet emission in Zn_2GeO_4 microrods Dolado Fernández, Jaime Hidalgo Alcalde, Pedro Méndez Martín, María Bianchi 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. 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. 2023-06-22T10:41:39Z 2023-06-22T10:41:39Z 2022 journal article 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/ eng RTI2018-097195-B-I00 PCIN- 2017-106 https://creativecommons.org/licenses/by-nc-nd/3.0/es/ open access Atribución-NoComercial-SinDerivadas 3.0 España Wiley-V C H VERLAG GMBH