Synthesis of NaLa(MoO4)2:Eu~(3+)/Yb~(3+) Phosphors via Microwave-Modified Sol-Gel Route and Their Upconversion Photoluminescence Properties

摘要

NaLa_(1-x)(MoO4)2:Eu~(3+)/Yb~(3+) phosphors with doping concentrations of En~(3+) and Yb~(3+) (x = Eu~(3+) + Yb~(3+), Eu~(3+) = 0.05, 0.1. 0.2 and Yb~(3+) = 0.2, 0.45) were successfully synthesized via the microwave-modified sol-gel route and the upconversion and spectroscopic properties were investigated. Well-crystallized particles showed a fine and homogeneous morphology with particle sizes of 5-10 urn. Under excitation at 980 nm, NaLa_(0.5)(MoO4)2:Er_(0.05)Yb_(0.45) particles exhibited a strong 525 nm emission band and a weak 550 nm emission band in the blue region and a very weak 655 nm emission band in the red region. The Raman spectra of NaLa_(0.8)(MoO4)2:Eu_(0.2), NaLa_(0.7)(MoO4):Eu_(0.1)Yb_(0.2) and NaLa_(0.5)(MoO4)2:Eu_(0.45)Yb_(0.45) particles indicated the domination of strong peaks at higher frequencies (762, 890, 1358 and 1430 cm~(-1)) and weak peaks at lower frequencies (323, 388 and 450 cm~(-1)).