Amplified spontaneous emission and optical gain characteristics of sexithiophene single crystals

Tahir, Muhammad and Sayyad, Muhammad Hassan and Said, Suhana Mohd and Sabri, Mohd Faizul Mohd and Sarker, Md Mahidur Rahman (2020) Amplified spontaneous emission and optical gain characteristics of sexithiophene single crystals. Optical Materials, 100. p. 109695. ISSN 0925-3467

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Official URL: https://doi.org/10.1016/j.optmat.2020.109695

Abstract

This paper reports optical properties of a single crystal thiophene/phenylene co-polymer 5,5ʺʺ'-diphenyl-2,2′:5′,2ʺ:5ʺ,2ʺ′:5ʺ′,2ʺʺ:5ʺʺ, 2ʺʺ'-sexithiophene (P6T). The P6T crystals demonstrate high charge carriers’ mobility and large photoluminescence quantum efficiency (PLQE). Herein, the stimulated emission of P6T is studied within wide range of pump energies –refers to energy per pulse – (from 19 ± 0.5 μJ/cm2 to 64.2 ± 0.5 μJ/cm2) through amplified spontaneous emission (ASE) measurements by using Nd-YAG femtoseconds tunable pulsed laser at 445 nm excitation wavelength (λexc). ASE measurements exhibit lower threshold energy density (Eth) i.e., ~26 ± 0.5 μJ/cm2 which confirms optical amplification in P6T at 632 nm emission wavelength. The ASE characteristics of P6T are also studied as a function of different λexc ranging from 425 to 475 nm to find the wavelength for optimum amplification. It is observed that the maximum optical amplification for P6T occurs at a λexc of 445 nm. These crystals exhibit large optical gains which are measured to be 69 cm−1, 53 cm−1 and 29 cm−1 at excitation energies of 91 ± 0.5 μJ/cm2, 66 ± 0.5 μJ/cm2 and 43 ± 0.5 μJ/cm2, respectively. PL measurements of P6T crystals demonstrate large value of the PLQE ~57.36%. This study suggests the potential of P6T single crystal as one of the good candidates among high optical gain materials of its kind for its possible applications in solid-state lasers, photodetectors and optical amplifiers. © 2020

Item Type: Article
Uncontrolled Keywords: Phenylene/thiophene co-polymer; Oligothiophenes; Amplified spontaneous emission (ASE); Optical gain; P6T single crystal
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 16 Jun 2020 02:46
Last Modified: 16 Jun 2020 02:46
URI: http://eprints.um.edu.my/id/eprint/24847

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