Chawla, Santa and Roy, Tapashree and Majumder, Kanishka and Yadav, Ashish (2014) Red enhanced YAG:Ce, Pr nanophosphor for white LEDs. Journal of Experimental Nanoscience, 9 (8). 776-784 . ISSN 1745-8080

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Rare earth ion Pr3+ was co doped in yellow emitting YAG:Ce nanophosphor to introduce red emission for improving colour rendering property of white LED. Nanocrystalline YAG:Ce, YAG:Ce, Pr was synthesised by a single step auto combustion process. Photoluminescence (PL) emission spectra of YAG:Ce, Pr nanophosphor, when excited by 460nm blue light, exhibited sharp red emission peaks at 610nm from Pr3+ ions in addition to broad yellow emission from Ce3+ peaking at 540nm due to charge transfer from excited Ce3+ 5d band to P-3(J)/D-1(2) level of Pr3+. Ce3+ (yellow) and Pr3+ (red) emission decays in tens of nanoseconds and microseconds, respectively. Electroluminescence spectra of blue LED with developed phosphor layer shows colour coordinates (0.30, 0.39) close to ideal white light.

Item Type: Article
Additional Information: Copyright for this article belongs to M/S Taylor & Francis.
Uncontrolled Keywords: photoluminescence auto combustion synthesi rare earth activator white LED
Subjects: Chemistry
Materials Science
Depositing User: Dr. Rajpal Walke
Date Deposited: 04 Nov 2015 07:23
Last Modified: 04 Nov 2015 07:23

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