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

PDF - Published Version Restricted to Registered users only Download (1018Kb) | Request a copy

Abstract

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
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	04 Nov 2015 07:23
Last Modified:	04 Nov 2015 07:23
URI:	http://npl.csircentral.net/id/eprint/1495

Actions (login required)

View Item