Optical Absorption of Er3+/Nd3+ Codoped Lithium Niobate Tellurite Glass

Hasim Nurhafizah; Md Supar Rohani; M.R. Sahar; Sib Krishna Ghoshal

doi:10.4028/www.scientific.net/AMR.1107.415

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1107Optical Absorption of Er3+/Nd3+ Codoped Lithium...

Optical Absorption of Er³⁺/Nd³⁺ Codoped Lithium Niobate Tellurite Glass

Abstract:

Keywords: Tellurite Glass, UV-Vis-NIR, absorption, Urbach energy. Abstract: To improve the optical behaviour of Lithium Niobate Tellurite glass with rare- earth dopant are the important issue from application and device perspectives. Er³⁺ and Nd³⁺ doped tellurite glasses of molar composition (70-x-y)TeO₂– 15Li₂CO₃– 15Nb₂O₅ – xEr₂O₃– yNd₂O₃system (x = 0 mol % and 1.0 mol %) (0 mol % ≤ y ≤ 1.0 mol %) have successfully been made by using melt quenching technique. The physical properties of the glass sample are obtained. From Ultraviolet- Visible- Near Infrared (UV-Vis-NIR) Spectroscopy, it is observed that the spectrum consists absorption peaks which corresponded to transitions from both ground state of Erbium, ⁴I_15/2 to the excited state of ⁴I_15/2, ⁴I_13/2, ⁴I_3/2, ⁴I_11/2, ²H_9/2, ⁴I_9/2, ²H_11/2, ⁴S_3/2, ²H_11/2 and ⁴F_7/2 respectively and Neodymium, ⁴I_9/2 to the excited state of ⁴I_15/2, ⁴I_15/2, ⁴I_3/2, ⁴F_9/2, ²G_7/2, ²G_9/2 and ²G_11/2respectively. The indirect band gaps obtained from the above dependence are the interband transitions, but later it involves the phonon interaction where the values of indirect optical band gaps lie between 2.84 eV to 3.12 eV as the Nd₂O₃content increase. The Urbach energy for the glass system decreases from 0.31 eV to 0.21 eV as the Nd₂O₃content increase.

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Advanced Materials Research (Volume 1107)

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415-419

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1107.415

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Online since:

June 2015

Authors:

Hasim Nurhafizah, Md Supar Rohani*, M.R. Sahar, Sib Krishna Ghoshal

Keywords:

Absorption, Tellurite Glass, Urbach Energy, UV-VIS-NIR

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