Synthesis and luminescence properties of La2Zr2O7:R (R = Sm3+, Bi3+, Sm3+/Bi3+) phosphor. (July 2018)

• Record Type: Journal Article
• Authors: Cao, Renping; Quan, Guanjun; Shi, Zhihui; Chen, Ting; Luo, Zhiyang; Zheng, Guotai; Hu, Zuofu
• Is Part Of: Journal of physics and chemistry of solids. Volume 118(2018)
• Page Start: 109
• Page End: 113
• Publication Date: 2018-07
• Subjects: Phosphor -- La2Zr2O7 -- Bi3+ ion -- Sm3+ ion -- Tunable emission; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2018.03.002
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: La2 Zr2 O7 :R (R = Sm 3+, Bi 3+, Sm 3+ /Bi 3+ ) phosphors are synthesized by solid-state reaction method in air. Blue emission band peaking at ∼462 nm of La2 Zr2 O7 :Bi 3+ phosphor with excitation at 312 nm is observed in the range of 370–610 nm due to 3 P 1 → 1 S 0 transition of Bi 3+ ion and D → 1 S0 transition between Bi 3+ and Zr 4+ ions. La2 Zr2 O7 :Sm 3+ phosphor with excitation at 407 nm shows reddish orange light in the range of 550–750 nm owing to 4 G5/2 → 6 H J ( J = 5/2, 7/2, 9/2, and 11/2) transitions of Sm 3+ ion. Tunable emission from blue to white of La2 Zr2 O7 :Sm 3+, Bi 3+ phosphor with excitation at 312 nm can be observed due to the changing Bi 3+ or Sm 3+ ion concentration. La2 Zr2 O7 :Sm 3+, Bi 3+ phosphor with excitation at 407 nm only emits reddish orange because Bi 3+ has no absorption at 407 nm. The energy transfer from Bi 3+ to Sm 3+ is discussed. The luminous mechanism is explained by the energy level diagrams of Bi 3+ and Sm 3+ ions. Graphical abstract: Highlights: La2 Zr2 O7 :Sm 3+, Bi 3+ phosphors are synthesized by solid-state reaction method in air. La2 Zr2 O7 :Bi 3+, La2 Zr2 O7 :Sm 3+, and La2 Zr2 O7 :Sm 3+, Bi 3+ phosphors are compared and analyzed. The luminous mechanism is explained by the energy level diagrams of Bi 3+ and Sm 3+ ions.