Abstract and References
Transactions on Science and Technology Vol. 4, No. 3, 209-217, 2017

Tuning Optical Properties of Erbium-Doped Zinc-Sodium Tellurite Glass Via Incorporation of Gold Nanoparticles

Reuben Ho Chee Wui , Asmahani Awang, Alvie Lo Sin Voi, Chee Fuei Pien, Noraini Abdullah, Jedol Dayou

ABSTRACT
Glasses with composition of 70TeO2-20ZnO-10Na2O-0.5Er2O3-(x) Au where x=0.0, 0.1, 0.3 and 0.4 mol% are synthesized via melt-quenching technique. Optical characterization is performed using UV-Vis spectroscopy. Ten absorption peaks are evidenced at 379 nm, 406 nm, 443 nm, 452 nm, 489 nm, 522 nm, 544 nm, 653 nm, 800 nm and 975 nm correspond to Er3+ transitions of 4I15/24G11/2, 4I15/22H9/2, 4I15/24F3/2, 4I15/24F5/2, 4I15/24F7/2, 4I15/22H11/2, 4I15/24S3/2, 4I15/24F9/2, 4I15/24I9/2 and 4I15/24H1/2, respectively. Direct band gap (Edir), indirect band gap (Eindir) and Urbach energy (EU) are estimated to be 3.403-3.420 eV, 3.131-3.198 eV and 0.152-0.180 eV respectively. The Edir, Eindir and EU parameters vary as gold nanoparticles (Au NPs) are incorporated into glass matrix and this leads to the generation of non-bridging oxygen, subsequently changing the structure of glass.

KEYWORDS: Nanoparticles; direct band gap; indirect band gap; Urbach energy; non-bridging oxygen

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