Luminescence of biexcitons in silver halide crystalsстатья
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Дата последнего поиска статьи во внешних источниках: 1 февраля 2021 г.
Аннотация:As it is known from Urbach rule, free excitons defining the fundamental absorption edge in AgBr1 − xClx(0 ⩽ x ⩽ 1). The process of primary Frenkel defect creation which involves free exciton states even in AgCl and biexciton creation in AgCl are discussed. The fast luminescence band at ≈3.0 eV observed in AgCl under high-density pulsed electron beam and laser excitation has been studied. It is shown that its intensity is a non-linear function of the excitation density. We suggest that the fast luminescence comes from biexcitons; binding energies of such biexcitons in AgBr1 − xClx(0 ⩽ x ⩽ 1) are estimated.