Open AccessSynthesis of Dy3+, Eu3+ and Tb3+ Activated Y2O2S Optoelectronic Phosphors for N-UV LED Applications
Author(s) -
V. V. Shinde,
S. J. Dhoble
Publication year - 2020
Publication title -
international journal of innovative technology and exploring engineering
Language(s) - English
Resource type - Journals
ISSN - 2278-3075
DOI - 10.35940/ijitee.d1412.029420
Subject(s) - phosphor , photoluminescence , ultraviolet , materials science , luminescence , doping , analytical chemistry (journal) , chromaticity , dopant , activator (genetics) , optoelectronics , chemistry , optics , physics , biochemistry , chromatography , gene
In this, a series of iso-structural Y2O2S (RE3+ = Dy3+ , Eu3+ and Tb3+) phosphors were synthesized by high temperature solid state reaction method. All the phosphors exhibit strong line and broad excitation in the near ultraviolet (n-UV) region. Bright color emission in blue, green and red color region of electromagnetic hue cycle was noticed. The concentration of activator doped was optimized from the photoluminescence (PL) study. The quenching in luminescence intensity after particular concentration of dopant is discussed here. Y2O2S phosphor doped with Dy3+displays useful blue and yellow emission bands at 487nm and 574nm, when stimulated by 388nm excitation wavelength. Y2O2S:Eu3+ phosphor displays an orange and red emission at 594nm and 620nm, when stimulated at 396 nm. Whereas, Y2O2S:Tb3+ phosphor displays weak blue radiation in the range 485nm and strong green radiation at 545nm, when stimulated at 305 nm. The excitation spectra used for the Y2O2S:RE3+ (RE3+ = Dy3+ , Eu3+ and Tb3+) phosphor is in the near ultraviolet (n-UV) region spanning from 300 nm to 400 nm, which is a peculiarity of near ultraviolet stimulated LED. The outcome of the RE3+ (RE3+= Dy3+ , Eu3+and Tb3+) absorption on the luminescence properties of Y2O2S:RE3+ phosphors was also studied.