Color tunable emission via efficient Ce3+→Tb3+ energy transfer pair in MgYSi2O5N oxynitride phosphor for near-UV-pumped white LEDs. (April 2017)

• Record Type: Journal Article
• Authors: Huo, Jiansheng; Lü, Wei; Shao, Baiqi; Feng, Yang; Zhao, Shuang; You, Hongpeng
• Is Part Of: Dyes and pigments. Volume 139(2017)
• Page Start: 174
• Page End: 179
• Publication Date: 2017-04
• Subjects: Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2016.12.012
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: An oxynitride phosphor MgYSi2 O5 N co-doped with Ce 3+ and Tb 3+ was successfully synthesized by the conventional solid-state reaction at 1623 K for 2 h in NH3 atmosphere. X-ray powder diffraction profiles, photoluminescence spectra, luminescence decay curves and chromaticity variation of the samples were investigated in detail. The photoluminescence properties showed that the Tb 3+ ions exhibited characteristic green emission peaks at 545 nm corresponding to the strong excitation band of Ce 3+ ions over a broad spectral range between 220 and 380 nm which matched well with the dominant emission band of near UV LED chips. The efficient energy transfer from Ce 3+ to Tb 3+ was verified by the excitation and emission spectra together with the luminescence decay curves. The corresponding efficiencies of energy transfer and energy transfer mechanisms were also calculated and analyzed according to the variations of the lifetime values of Ce 3+ . With the doping content of Tb 3+ ions increasing, the emitting color of phosphors can be tuned from purplish-blue to green upon 365 nm excitation. All the results indicated that the developed phosphors have a potentiality to be a kind of near UV-convertible phosphor for application in phosphor-converted white-light-emitting diodes. Highlights: Ce 3+ & Tb 3+ co-doped MgYSi2 O5 N oxynitrides was successfully synthesized by the solid-state method for the first time. MgYSi2 O5 N: Ce 3+, Tb 3+ can emit green light upon n -UV excitation via energy transfer from Ce 3+ to Tb 3+ ions. The MgYSi2 O5 N: Ce 3+, Tb 3+ phosphors may be good candidates as potential green component for application in n -UV WLEDs.