Intrinsic radiative lifetime derived via absorption cross section of one-dimensional excitons

Abstract

Intrinsic radiative lifetime is an essential physical property of low-dimensional excitons that represents their optical transition rate and wavefunction, which directly measures the probability of finding an electron and a hole at the same position in an exciton. However, the conventional method that is used to determine this property via measuring the temperature-dependent photoluminescence (PL) decay time involves uncertainty due to various extrinsic contributions at high temperatures. Here, we propose an alternative method to derive the intrinsic radiative lifetime via temperature-independent measurement of the absorption cross section and transformation using Einstein's A-B-coefficient equations derived for low-dimensional excitons. We experimentally verified our approach for one-dimensional (1D) excitons in high-quality 14 × 6 nm2 quantum wires by comparing it to the conventional approach. Both independent evaluations showed good agreement with each other and with theoretical predictions. This approach opens a promising path to studying low-dimensional exciton physics.

Exciton recombination dynamics in nanoring cycloparaphenylenes

“…To discuss whether the excited states are delocalized or localized over the [n]CPPs, we assumed that the excitons can move in a circumferential direction along the [n]CPPs. For free excitons in 1D systems, the radiative recombination rate of an exciton is proportional to the oscillator strength f x , which for a 1D structure is expressed by [24][25][26][27]…”

Роль Модельных Представлений В Описании Кинетики Люминесценции Гибридных Нитевидных Нанокристаллов

“…Однако отсутствие устойчивого формализма часто приводит к неоднозначности в трактовке экспериментальных результатов. В этом случае принципиальное значение приобретает качество обработки экспериментальных зависимостей кинетики люминесценции [13][14][15][16][17]. Целью исследования настоящей работы являлось изучение кинетики фотолюминесценции (ФЛ) гибридной полупроводниковой наноструктуры, представляющей собой массив ННК InP/InAsP/InP, сформированных методом молекулярно-пучковой эпитаксии на подложке Si(III), путём аппроксимации экспериментальных кинетических зависимостей несколькими математическими моделями.…”

Intrinsic Delocalization during the Decay of Excitons in Polymeric Solar Cells

“…In 2013, it was shown that the radiative decay of an exciton can efficiently display the intrinsic physical property of a low-dimensional semiconductor, while the extrinsic disturbances hardly contribute to the properties of the exciton [ 19 , 20 , 21 , 22 ]. Moreover, various details with respect to the intrinsic physical property—such as decay time—can be extracted from the exciton decay in conjugated polymers [ 23 , 24 , 25 , 26 ].…”