Open AccessUltrafast Zn(Cd,Mg)O:Ga nanoscintillators with luminescence tunable by band gap modulation
Author(s) -
Lenka Procházková,
Václav Čuba,
Alena Beitlerová,
V. Jarý,
Sergey Omelkov,
M. Nikl
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.029482
Subject(s) - radioluminescence , cathodoluminescence , photoluminescence , materials science , exciton , luminescence , optoelectronics , ultrashort pulse , analytical chemistry (journal) , band gap , optics , phase (matter) , diode , spectral line , laser , chemistry , physics , organic chemistry , chromatography , quantum mechanics , detector , scintillation , astronomy
Photo-induced synthesis was used for preparation of powder Zn(Cd,Mg)O:Ga scintillating nanocrystals featuring properties of solid solutions. Only ZnO phase was identified without any phase separation up to 10% of Cd after optimization of the preparation. Radioluminescence spectra show the exciton-related emission in UV spectral range with significant blue (ZnMgO:Ga) or red (ZnCdO:Ga) shifts. The emission wavelength is tunable by the Cd/Mg content. Defect-related emission is completely suppressed after treatment in reducing atmosphere. Photoluminescence and cathodoluminescence decays show extremely fast component. Subnanosecond decay together with band gap modulation make Zn(Cd,Mg)O:Ga good candidate for practical applications like X-ray induced photodynamic therapy (PDTX) or those requiring superfast timing.