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Abdullah Saleh Aldwayyan

Professor

Member of KSU scientific council as a representative of the college of sciences

كلية العلوم
College of Science, Physics and Astronomy Dept. Office 2A23
publication
Journal Article
2023

Investigation of the Amplified Spontaneous Emission Threshold of Cesium Lead Bromide Perovskite Quantum Dots at Different Excitation Wavelengths

The goal of this research is to see how excitation wavelength affects steady-state photoluminescence (PL), time-resolved photoluminescence (TRPL), and amplified spontaneous emission (ASE) in CsPbBr3 perovskite quantum dots (PQD). At PL and ASE, a plausible mechanism for explaining the excitation wavelength-dependent phenomena was proposed. The PL and ASE properties of CsPbBr3 PQD as optical materials were examined experimentally at excitation wavelengths of 355–450 nm. An optical parametric amplifier system was used to accomplish optical pumping utilizing a laser pulse with a pulse duration of 70 ps. The ASE threshold was explored and compared the ratio of photons in the pump pulse to band gap energies. The excitation wavelength (λex) has a considerable influence on the ASE behavior, with high optical densities correlating to optimal excitation, as evidenced by the absorption spectrum, which has a larger absorption coefficient. Furthermore, the energy density at the ASE threshold was closely correlated with the λex following the absorption spectrum. Also, it has been demonstrated that changing the excitation wavelength reduces the PQD PL lifetime. Finally, electron-hole pairs can be produced at a reasonable depth from the film's surface using the appropriate excitation wavelength.

Publication Work Type
Research
Volume Number
12
Issue Number
5
Magazine \ Newspaper
ECS Journal of Solid State Science and Technology
more of publication
publications

In this study, we investigated the optoelectronic properties of cubic (Pm3m) and orthorhombic (Pnma) CsPbX3 (X = I, Br, and Cl). We utilized the full potential linear augmented plane wave method,…

by H. M. Ghaithan, S. M. H. Qaid, Z. A. Alahmed, H. S. Bawazir and A. S. Aldwayyan
2023
Published in:
Materials
publications

The goal of this research is to see how excitation wavelength affects steady-state photoluminescence (PL), time-resolved photoluminescence (TRPL), and amplified spontaneous emission (ASE) in…

by Qaid, SMH ; Ghaithan, HM Ghaithan,; Aldwayyan, AS
2023
publications

A solid redox mediator (solid electrolyte) with an electrical conductivity (σ25°C) greater than 10−4 S cm−1 is an essential requirement for a dye-sensitized solar cell in the harsh weather of Gulf…

by R. Gupta, H. Shaikh, A. Imran, I. Bedja, A.F. Ajaj, A. S. Aldwayyande, A. Khan and R. Ayub
2024