Photoluminescence Properties of Sm³⁺-Doped La₂O₃ Powders

Abstract:

The Sm³⁺-Doped La₂O₃ powders were prepared by precipitation method. The room temperature photoluminescence (PL) spectra of Sm³⁺-Doped La₂O₃ powders doped with different Sm³⁺ concentration excited at 405 nm have been investigated. The PL spectra showed three main strong emissions peaks at near 572, 613, and 657 nm, which were due to the f-f forbidden transitions of the 4f electrons of Sm³⁺, corresponding to ⁴G_5/2→⁶H_5/2 (572 nm), ⁶H_7/2(613 nm), and ⁶H_9/2(657 nm), respectively. The optimum Sm³⁺ concentration in La₂O₃ powders for optical emission was determined to be 2.0 %. Since the 2% Sm-doped La2O3 offer a rather strong f–f transition excitation in near the UV region, the as-prepared phosphors are likely to be used as potential red phosphors for near-ultraviolet (370-410 nm) light-emitting diodes (LEDs).

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 967-972
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.967
• Online since: November 2011
• Authors: Qi Xiao, Gao Yuan Zhu
• Keywords: Chemical Synthesis, Photoluminescence (PL), Sm³⁺-Doped La₂O₃

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