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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
المنشورات
مقال فى مجلة
2012

Silicon nanoparticle-ZnS nanophosphors for ultraviolet-based white light emitting diode

Stupca, M. . 2012

Present red phosphor converters provide spectra dominated by sharp lines and suffer from availability and stability issues which are not ideal for color mixing in display or solid state lighting applications. We examine the use of mono dispersed 3 nm siliconnanoparticles, with inhomogeneously broadened red luminescence as an effective substitute for red phosphors. We tested a 3-phase hybrid nanophosphor consisting of ZnS:Ag, ZnS:Cu,Au,Al, and nanoparticles. Correlated color temperature is examined under UV and LED pumping in the range 254, 365–400 nm. The temperature is found reasonably flat for the longer wavelengths and drops for the shorter wavelengths while the color rendering index increases. The photo stability of the phosphors relative to the siliconnanoparticles is recorded. The variation in the temperature is analyzed in terms of the strength of inter-band–gap transition and continuum band to band transitions.

 

رقم المجلد
112
رقم الانشاء
7
مجلة/صحيفة
J. Appl. Phys
مزيد من المنشورات
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,…

بواسطة H. M. Ghaithan, S. M. H. Qaid, Z. A. Alahmed, H. S. Bawazir and A. S. Aldwayyan
2023
تم النشر فى:
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…

بواسطة 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…

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