Intraband Luminescence in Ionic Crystals

Abstract

Time-resolved luminescence spectra of CsI, NaI, cr-Al,O,, and AgBr are investigated under subnanosecond electron pulse excitation. New intrinsic emission bands with a decay time less than 20 ps are revealed. It is proposed that the fast emission components originate from hot carrier intraband radiative transitions. The intraband luminescence spectra and light output are temperature independent and are not affected by crystal impurities. The correlation between the intraband luminescence spectra and crystal band structure is discussed.HCCJIeAOBanHCb CneKTpbI JIIoMAHeCqeHqAA KpACTaJIJIOB CSI, NaI, tX-Al,O, A AgBr npA B036YXAeHHH CY6HaHOCeKYHAHblMA AMIIyJIbCaMH 3JIeKTpOHOB. 06HapyXeHbI IIOJIOCbI JIIoMAHeCUeHIJAM C naroceKYHAHblM BpeMeHeM peJIaKCaUAEi, 06yCnOBJIeHHbIe A3JIyYaTenbHbIMA BHYTpH3OHHbIMA IIepOXOAaMH rOpRYAX HOCATeJIefi 3apXAa. CIIeKTpbI A BbIXOA BHYTPA3HHOfi JIKIMAHeCqeHqAA He 3aBACRT OT TeMnepaTYPbI A IIpIlMeCHOrO COCTaBa KpACTaJIJIa. 0 6 c y x , q a e~c~ KOppenRUAR CIIeKTpOB BHYTPA30HHOfi JIWMHHecqeHqm c ~O H H O~~ C T P Y K T Y P O~~ KpAcTanna.

Estimation of yield and decay kinetics of intraband luminescence in multiple-parabolic-branch-band model with account of phonons

“…It was shown that characteristic time of the IBL occurs to be about 1.7 ps in MPBB model, which corresponds to the experimental data [11]- [12].…”

“…The Monte Carlo method was used to calculate integrals in expressions (9)(10)(11)16). The calculations were carried out in the energy range from 0.1 to 6.1 eV with a step of 0.1 eV for both E and  .…”

“…In the case of rates of radiative transitions in the second order of the perturbation theory (11), for the given energies E and  at the current grid node, the quasi-wave vector of the initial i k ( ) ( )…”

Temperature dependence of CsI(Tl) gamma-ray excited scintillation characteristics

“…Since intraband luminescence is governed by the band structure of the host crystal, both the emission spectrum and scintillation efficiency will be independent of impurities and activators in the crystal. Additionally, the band structure does not change significantly with tcn_perature, and thus the intraband luminescence emission spectrum and scintillation efficiency will be approximately independent of temperature [DEI92].…”

Ultrafast hybrid nanocomposite scintillators: A review

“…As a result, the rise time of the luminescence caused by their recombination is determined by the capture stage duration, which can be below 1 ps [51]. Hot intraband luminescence (IBL) [52], [53], [54] occurs as a process competing to thermalization before the capture stage, therefore its decay time is determined by the thermalization stage duration. In some materials (e.g., BaF2), holes at the uppermost core levels have too low energy for Auger recombination, so they undergo self-trapping [55] and float to the top of the core band.…”