InGaN/GaN multiple quantum well for superfast scintillation application: Photoluminescence measurements of the picosecond rise time and excitation density effect

Year: 2019

Authors: Toci G., Gizzi L.A., Koester P., Baffigi F., Fulgentini L., Labate L., Hospodkova A., Jary V., Nikl M., Vannini M.

Autors Affiliation: CNR, INO, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, FI, Italy; Ist Nazl Fis Nucl, Sez Firenze, Via Giovanni Sansone 1, I-50019 Sesto Fiorentino, FI, Italy; CNR, INO, Intense Laser Irradiat Lab, Via Moruzzi 1, I-56124 Pisa, Italy; Ist Nazl Fis Nucl, Sez Pisa, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy; Acad Sci Czech Republ, Inst Phys, Cukrovarnicka 10, Prague 16200, Czech Republic.

Abstract: We report the study of the fast rise time and decay time in the ps time scale of the excitonic luminescence of a multiple quantum well (MQW) heterostructure of InGaN/GaN, including the excitation density effect. These structures were proposed as ultrafast scintillators for soft X-ray detectors and particle beam diagnostics. Measurements were carried out with a Hadland Imacon 500 streak camera following excitation of the sample by laser pulses of few tens of µJ at 266 nm and 400 nm, with pulse duration less than 200 fs. The rise time of the detected MWQ luminescence was less than 10 ps, with a possible contribution from the detection system and signal collection geometry. The calibration and the signal processing techniques employed to fully exploit the time resolution of the detection system are also described.

Journal/Review: JOURNAL OF LUMINESCENCE

Volume: 208      Pages from: 119  to: 124

More Information: 631 08.08.2016. 16-15569S. College of Natural Resources, University of California Berkeley, CNR. European Cooperation in Science and Technology, FAST TD1401. – Financial support of Czech National Foundation grant no. 16-15569S and European project COST, FAST TD1401 are gratefully acknowledged. We also acknowledge funding from the CNR funded Italian research Network ELI-Italy (D.M. n. 631 08.08.2016 ).
KeyWords: Multiple quantum wells, InGaN/GaN, Scintillator, Streak camera, Ultrafast rise-time measurements
DOI: 10.1016/j.jlumin.2018.12.034

ImpactFactor: 3.280
Citations: 5
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