Luminescence characteristics of Sm3+-doped lithium barium gadolinium silicate glasses for Orange LED's

I Khan; G Rooh; R Rajaramakrishna; N Srisittipokakun; H J Kim; K Kirdsiri; J Kaewkhao

doi:10.1016/j.saa.2019.01.086

Luminescence characteristics of Sm³⁺-doped lithium barium gadolinium silicate glasses for Orange LED's

Spectrochim Acta A Mol Biomol Spectrosc. 2019 May 5:214:14-20. doi: 10.1016/j.saa.2019.01.086. Epub 2019 Jan 29.

Authors

I Khan¹, G Rooh¹, R Rajaramakrishna², N Srisittipokakun³, H J Kim⁴, K Kirdsiri⁵, J Kaewkhao⁶

Affiliations

¹ Department of Physics, Abdul Wali Khan University, Mardan 23200, Pakistan.
² Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom 73000, Thailand.
³ Physics Program, Faculty of Science and Technology, Rajabhat University, Nakhon Pathom 73000, Thailand; Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom 73000, Thailand.
⁴ Department of Physics, Kyungpook National University, Deagu 702-701, Republic of Korea.
⁵ Physics Program, Faculty of Science and Technology, Rajabhat University, Nakhon Pathom 73000, Thailand; Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom 73000, Thailand. Electronic address: nanonymous@webmail.npru.ac.th.
⁶ Physics Program, Faculty of Science and Technology, Rajabhat University, Nakhon Pathom 73000, Thailand; Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom 73000, Thailand. Electronic address: mink110@hotmail.com.

PMID: 30743072
DOI: 10.1016/j.saa.2019.01.086

Abstract

Traditional melt-quenching technique is adopted for synthesis of Sm₂O₃ doped lithium barium gadolinium silicate (LBGS: Li₂O-BaO-Gd₂O₃-SiO₂) glasses. These glass samples are characterized by different spectroscopic techniques under ambient conditions. Density and molar volume of the present LBGS glass samples increase with increasing Sm³⁺ ion-concentration. JO intensity parameters Ω_λ (where λ = 2, 4 and 6) are evaluated by using Judd-Ofelt theory and Ω₄ > Ω₂ > Ω₆ trend is observed. Furthermore, these parameters are used to evaluate radiative properties like radiative transition probability, branching ratio, radiative lifetime and stimulated emission cross-section for state ⁴G_5/2 of Sm³⁺ ion. The measured color coordinates for the title glass fall within orange region of CIE diagram. For the present LBGS glasses, the correlated color temperature values are less than warm. The lifetime for the ⁴G_5/2 decreases from 2.468 to 0.566 ms when concentration increases from 0.1 to 2.0 mol% of Sm³⁺ ions. The analysis of non-exponential behavior of the decay profile through Inokuti-Hirayama model for S = 6 indicates that the energy transfer between Sm³⁺ ions is due to dipole-dipole interactions. Further energy transfer parameters (Q), critical distance (R_o, Å) and donor-acceptor interaction parameters (C_DA x 10^-40 cm⁶/s) of Sm³⁺ ions doped LBGS glasses were evaluated and compared to other glasses. From the evaluated results it is suggested that the present novelty of the work emphasizes on new matrix LBGS doped with Sm³⁺ ions showing increasing energy transfer rate with increasing in concentration of Sm₂O₃ content indicating these glasses are potential candidate for orange-light emitting device applications.

Keywords: Absorption; Energy transfer; Rare earth, Judd-Ofelt analysis; Silicate glasses.