Stimulated luminescence emission from localized recombination in randomly distributed defects

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Stimulated luminescence emission from localized recombination in randomly distributed defects. / Jain, Mayank; Guralnik, Benny; Andersen, Martin Thalbitzer.

In: Journal of Physics: Condensed Matter, Vol. 24, No. 38, 2012, p. 385402.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Author

Jain, Mayank; Guralnik, Benny; Andersen, Martin Thalbitzer / Stimulated luminescence emission from localized recombination in randomly distributed defects.

In: Journal of Physics: Condensed Matter, Vol. 24, No. 38, 2012, p. 385402.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Bibtex

@article{47edac7ff3aa4c3398d110db1d76263d,
title = "Stimulated luminescence emission from localized recombination in randomly distributed defects",
publisher = "Institute of Physics Publishing",
author = "Mayank Jain and Benny Guralnik and Andersen, {Martin Thalbitzer}",
year = "2012",
doi = "10.1088/0953-8984/24/38/385402",
volume = "24",
number = "38",
pages = "385402",
journal = "Journal of Physics: Condensed Matter",
issn = "0953-8984",

}

RIS

TY - JOUR

T1 - Stimulated luminescence emission from localized recombination in randomly distributed defects

A1 - Jain,Mayank

A1 - Guralnik,Benny

A1 - Andersen,Martin Thalbitzer

AU - Jain,Mayank

AU - Guralnik,Benny

AU - Andersen,Martin Thalbitzer

PB - Institute of Physics Publishing

PY - 2012

Y1 - 2012

N2 - We present a new kinetic model describing localized electronic recombination through the excited state of the donor (d) to an acceptor (a) centre in luminescent materials. In contrast to the existing models based on the localized transition model (LTM) of Halperin and Braner (1960 Phys. Rev. 117 408–15) which assumes a fixed d → a tunnelling probability for the entire crystal, our model is based on nearest-neighbour recombination within randomly distributed centres. Such a random distribution can occur through the entire volume or within the defect complexes of the dosimeter, and implies that the tunnelling probability varies with the donor–acceptor (d–a) separation distance. We first develop an ‘exact kinetic model’ that incorporates this variation in tunnelling probabilities, and evolves both in spatial as well as temporal domains. We then develop a simplified one-dimensional, semi-analytical model that evolves only in the temporal domain. An excellent agreement is observed between thermally and optically stimulated luminescence (TL and OSL) results produced from the two models. In comparison to the first-order kinetic behaviour of the LTM of Halperin and Braner (1960 Phys. Rev. 117 408–15), our model results in a highly asymmetric TL peak; this peak can be understood to derive from a continuum of several first-order TL peaks. Our model also shows an extended power law behaviour for OSL (or prompt luminescence), which is expected from localized recombination mechanisms in materials with random distribution of centres.

AB - We present a new kinetic model describing localized electronic recombination through the excited state of the donor (d) to an acceptor (a) centre in luminescent materials. In contrast to the existing models based on the localized transition model (LTM) of Halperin and Braner (1960 Phys. Rev. 117 408–15) which assumes a fixed d → a tunnelling probability for the entire crystal, our model is based on nearest-neighbour recombination within randomly distributed centres. Such a random distribution can occur through the entire volume or within the defect complexes of the dosimeter, and implies that the tunnelling probability varies with the donor–acceptor (d–a) separation distance. We first develop an ‘exact kinetic model’ that incorporates this variation in tunnelling probabilities, and evolves both in spatial as well as temporal domains. We then develop a simplified one-dimensional, semi-analytical model that evolves only in the temporal domain. An excellent agreement is observed between thermally and optically stimulated luminescence (TL and OSL) results produced from the two models. In comparison to the first-order kinetic behaviour of the LTM of Halperin and Braner (1960 Phys. Rev. 117 408–15), our model results in a highly asymmetric TL peak; this peak can be understood to derive from a continuum of several first-order TL peaks. Our model also shows an extended power law behaviour for OSL (or prompt luminescence), which is expected from localized recombination mechanisms in materials with random distribution of centres.

U2 - 10.1088/0953-8984/24/38/385402

DO - 10.1088/0953-8984/24/38/385402

JO - Journal of Physics: Condensed Matter

JF - Journal of Physics: Condensed Matter

SN - 0953-8984

IS - 38

VL - 24

SP - 385402

ER -