title: InGaN/GaN multiple quantum well for fast scintillation application: radioluminescence and photoluminescence study.
abstract: We prepare InGaN/GaN multiple quantum well (MQW) structure by metal-organic vapour phase epitaxy and characterize it by fine XRD measurements. We demonstrate its suitability for scintillator application including a unique measurement of wavelength-resolved scintillation response under nanosecond pulse soft x-ray source in extended dynamical and time scales. The photoluminescence and radioluminescence were measured: we have shown that the ratio of the intensity of quantum well (QW) exciton luminescence to the intensity of the yellow luminescence (YL) band IQW/IYL depends strongly on the type and intensity of excitation. Slower scintillation decay measured at YL band maximum confirmed the presence of several radiative recombination centres responsible for wide YL band, which also partially overlap with the QW peak. Further improvements of the structure are suggested, but even the presently reported decay characteristics of the excitonic emission in MQW are better compared to the currently widely used single crystal YAP:Ce or YAG:Ce scintillators. Thus, such a type of a semiconductor scintillator is highly promising for fast detection of soft x-ray and related beam diagnostics.
authors.affiliation: Institute of Physics ASCR, v.v.i., Cukrovarnická 10, Praha 6, 162 00, Czech Republic.
authors.forename: Alice
authors.initials: A
authors.lastname: Hospodková
authors.forename: Martin
authors.initials: M
authors.lastname: Nikl
authors.forename: Oliva
authors.initials: O
authors.lastname: Pacherová
authors.forename: Jiří
authors.initials: J
authors.lastname: Oswald
authors.forename: Petr
authors.initials: P
authors.lastname: Brůža
authors.forename: Dalibor
authors.initials: D
authors.lastname: Pánek
authors.forename: Bartosz
authors.initials: B
authors.lastname: Foltynski
authors.forename: Eduard
authors.initials: E
authors.lastname: Hulicius
authors.forename: Alena
authors.initials: A
authors.lastname: Beitlerová
authors.forename: Michael
authors.initials: M
authors.lastname: Heuken