A novel greenish yellow-orange red Ba3Y4O9:Bi3+, Eu3+ phosphor with efficient energy transfer for UV-LEDs. Issue 47 (9th November 2015)

• Record Type: Journal Article
• Authors: Li, Kai; Lian, Hongzhou; Shang, Mengmeng; Lin, Jun
• Is Part Of: Dalton transactions. Volume 44:Issue 47(2015)
• Page Start: 20542
• Page End: 20550
• Publication Date: 2015-11-09
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c5dt03565a
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A series of novel color-tunable Ba3 Y4 O9 :Bi 3+, Eu 3+ phosphors have been prepared via the high-temperature solid-state reaction route and investigated. Abstract : A series of novel color-tunable Ba3 Y4 O9 :Bi 3+, Eu 3+ phosphors were prepared for the first time via the high-temperature solid-state reaction route. The effect of Bi 3+ concentration on the emission intensity of Ba3 Y4 O9 :Bi 3+ was investigated. The emission spectra of the Ba3 Y4 O9 :Bi 3+, Eu 3+ phosphors present both a greenish yellow band of Bi 3+ emission centered at 523 nm, and many characteristic emission lines of Eu 3+, derived from the allowed 3 P1 – 1 S0 transition of the Bi 3+ ion and the 5 D0 – 7 F J transition of the Eu 3+ ion, respectively. The energy transfer phenomenon from Bi 3+ to Eu 3+ ions is observed under UV excitation in Bi 3+, Eu 3+ co-doped Ba3 Y4 O9 phosphors, and their transfer mechanism is demonstrated to be a resonant type via dipole–quadrupole interaction. The critical distance between Bi 3+ and Eu 3+ for the energy transfer effect was calculated via the concentration quenching and spectral overlap methods. Results show that color tuning from greenish yellow to orange red can be realized by adjusting the mole ratio of Bi 3+ and Eu 3+ concentrations based on the principle of energy transfer. Moreover, temperature-dependent PL properties, CIE chromaticity coordinates and quantum yields of Ba3 Y4 O9 :Bi 3+, Eu 3+ phosphors were also supplied. It is illustrated that the as-prepared Ba3 Y4 O9 :Bi 3+, Eu 3+ phosphors can be potential candidates for color-tunable phosphors applied in UV-pumped LEDs.