2026-06-27T16:26:25Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/65162024-09-03T18:41:25Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Dolado Fernández, Jaime author Martínez Casado, María Ruth author Hidalgo Alcalde, Pedro author Gutiérrez, Rafael author Dianat, Arezoo author Cuniberti, Gianaurelio author Domínguez-Adame Acosta, Francisco author Díaz García, Elena author Méndez Martín, María Bianchi 2023-06-16T15:22:29Z 2023-06-16T15:22:29Z 2020-09-01 1359-6454 10.1016/j.actamat.2020.07.009 https://hdl.handle.net/20.500.14352/6516 http://dx.doi.org/10.1016/j.actamat.2020.07.009 https://www.sciencedirect.com/ Achieving efficient and stable ultraviolet emission is a challenging goal in optoelectronic devices. Herein, we investigate the UV luminescence of zinc germanate Zn_2GeO_4 microwires by means of photoluminescence measurements as a function of temperature and excitation conditions. The emitted UV light is composed of two bands (a broad one and a narrow one) associated with the native defects structure. In addition, with the aid of density functional theory (DFT) calculations, the energy positions of the electronic levels related to native defects in Zn_2GeO_4 have been calculated. In particular, our results support that zinc interstitials are the responsible for the narrow UV band, which is, in turn, split into two components with different temperature dependence behaviour. The origin of the two components is explained on the basis of the particular location of Zn_i in the lattice and agrees with DFT calculations. Furthermore, a kinetic luminescence model is proposed to ascertain the temperature evolution of this UV emission. These results pave the way to exploit defect engineering in achieving functional optoelectronic devices to operate in the UV region. eng Understanding the UV luminescence of zinc germanate: the role of native defects journal article URL https://docta.ucm.es/bitstreams/3cfe8e37-d527-43f0-9172-85e3322f0c75/download File MD5 625148f91ace93991fa84ec31088f6b1 5487840 application/pdf MendezBianchi108preprint.pdf