Excitation energy dependent switchable emission in SrZnO₂ nanophosphors: XAS and luminescence studies

Abstract

An unprecedented excitation energy dependent dual emission from SrZnO2 nanophosphors is observed, predicting its applicability for switchable light emitting devices.

Oxygen vacancies induced photoluminescence in $$\hbox {SrZnO}_2$$ nanophosphors probed by theoretical and experimental analysis

“…3 (d) 45 , 46 . Comparable XANES was also observed in SZO prepared by MEA fuel in our previous study, which was having oxygen vacancies in the system 1 . Also, the reference scan ( ), shown in Fig.…”

“…It is to be noted that comparable features were also obtained previously in SZO prepared by combustion synthesis using monoethanolamine (MEA) as fuel, where extended X-ray absorption fine structure (EXAFS) analysis revealed presence of oxygen vacancies in that system. Howbeit, denomination of various features was not clear 1 .…”

“…No band to band emission is observed in PL spectrum, which indicates the role of defect states present in forbidden gap responsible for the emission. Recently, our group reported that SZO nanophosphors synthesized by combustion synthesis using MEA fuel exhibit broad emission centering upon below band gap excitation bestowed by oxygen vacancies 1 . The slight change in emission is expected due to variation in synthesis conditions.…”

“…Oxide systems are widely explored as functional materials 1 – 3 and have been a playground for both fundamental as well as application based research because of exhibiting interesting properties attributed by native point defects. Presence of oxygen vacancies imparts interesting effects on optical, magnetic and structural properties in oxide semiconducting materials such as ZnO, , 2 , 4 – 10 .…”

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO2:Dy Nanophosphors

“…[ 13–15 ] The undoped system exhibits broad band luminescence bestowed by intrinsic defect states present in the forbidden band. [ 10,15–17 ] TL study upon gamma irradiation on the undoped SrZnO 2 revealed the existence of glow features in low‐ and high‐temperature regions, which were attributed to shallow and deep intrinsic defects. [ 10,18 ] SrZnO 2 system is substantially investigated as phosphor host for various activator ions.…”