Emission enhancement of LiLaMo2O8:Eu3+ phosphor by co-doping with Bi3+ and Sm3+ ions. (February 2018)

• Record Type: Journal Article
• Authors: Cao, Renping; Liao, Changlin; Xiao, Fen; Zheng, Guotai; Hu, Wen; Guo, Yimin; Ye, Yuanxiu
• Is Part Of: Dyes and pigments. Volume 149(2018)
• Page Start: 574
• Page End: 580
• Publication Date: 2018-02
• Subjects: Double molybdates -- Phosphors -- Energy transfer -- Red-emitting; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2017.11.023
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: A series of LiLaMo2 O8 :Eu 3+, R (R = Bi 3+ and Sm 3+ ) phosphors are synthesized by a high temperature solid-state reaction method in air. The crystal structures, fluorescence lifetimes, and luminescence properties are investigated in detail. LiLaMo2 O8 :Eu 3+ phosphor with excitation 395 nm shows red light in the range of 525–725 nm and it photoluminescence intensity may be enhanced ∼2.35 times due to energy transfer (ET) from a sensitizing species (Bi 3+ or Sm 3+ ) to Eu 3+ ion after Bi 3+ or Sm 3+ ion is co-doped. The optimal Eu 3+, Bi 3+, and Sm 3+ ion concentrations are 4%. Luminous mechanism of LiLaMo2 O8 :Eu 3+, R (R = Bi 3+ and Sm 3+ ) phosphors and ET processes between Eu 3+ and Bi 3+ /Sm 3+ ions are analyzed and explained by their excitation and emission spectra and energy level diagrams of Eu 3+, Bi 3+, and Sm 3+ ions. The experimental results indicate that LiLaMo2 O8 :Eu 3+, R (R = Bi 3+ and Sm 3+ ) phosphors may be used as potenial red emitting materials for white light emitting diodes (LEDs) based on either a near ultraviolet (∼395 nm) or blue (∼465 nm) chip. Graphical abstract: Highlights: LiLaMo2 O8 :Eu 3+, R (R = Bi 3+ and Sm 3+ ) phosphors are synthesized in air. PL intensity of LiLaMo2 O8 :Eu 3+ phosphor is enhanced ∼2.35 times due to co-doped Bi 3+ or Sm 3+ ion. Luminous mechanism and ET processes are analyzed and explained.