Reddish orange light emitting and thermal stability of the Sm2O2S/Sm2O2SO4 phosphors

Rodrigo V Rodriguesa; L U Khan; E J B Muri; J R Matos; A A L Marins

doi:10.21767/2472-1123-C1-021

Reddish orange light emitting and thermal stability of the Sm₂O₂S/Sm₂O₂SO₄ phosphors

2^nd Edition of EuroSciCon Conference on Chemistry
February 19-20, 2019 | Prague, Czech Republic

Rodrigo V Rodriguesa, L U Khan, E J B Muri, J R Matos and A A L Marins

Institute of Chemistry-University of Sao Paulo, Brazil Brazilian Nanotechnology National Laboratory (LNNano), Brazil Federal University of Espirito Santo, Brazil

Posters & Accepted Abstracts: J Org Inorg Chem

DOI: 10.21767/2472-1123-C1-021

Abstract

A spectroscopy study of Sm³⁺ phosphors was performed through photoluminescence spectra measurements. The phosphors were prepared from the thermal decomposition of hydrated samarium sulfate to obtain samarium oxysulfide (Sm₂O₂S) and oxysulfate (Sm₂O₂SO₄). Reddish-orange color emission was monitored from that of oxysulfide phosphor under ultraviolet (UV) excitation at 6H_{_5/2}â�?�?>4I_13/2 (466 nm) and the photoluminescence emission properties were characterized. The Sm³⁺ oxysulfide/ oxysulfate phosphors can be efficiently excited by UV and blue light, and their emission spectrum consists of three important narrow lines: 4G_5/2â�?�?>6H_5/2 (575 nm), 4G_5/2â�?�?>6H_7/2 (613 nm), and 4G_5/2â�?�?>6H_9/2 (658 nm) intraconfigurational transitions respectively. The final thermal stability of oxysulfide/oxysulfate phosphors was investigated systematically by TG/DTG measures. Based on the results, the as prepared Sm₂O₂S/Sm₂O₂SO₄ materials are promising reddish-orange-emitting phosphors for UV based white light-emitting diodes.