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Synthesis, Structural and Luminescent Properties of Novel Eu3 +:Y2CaZnO5 Nanophosphor for White Light-Emitting Diodes

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Novel red-emitting phosphors, Eu3+-doped Y2 CaZnO5 (YCZ), were synthesized by modified urea assisted sol–gel combustion method. The X-ray diffraction analysis indicates the uniform formation of single-phase triclinic YCZ nanoparticles even when the concentration of Eu3+ ions is as high as 50 mol%. TEM measurements revealed that the particles have uniform size distributions in the range of 10–30 nm. Luminescence properties have been characterized using photoluminescence excitation, emission spectra and decay time measurements. A strong charge transfer band (CTB) at around 250 nm is observed which is due to the Eu O interaction in the host along with the 4 f –4 f excitation bands due to Eu3+ ions in UV and blue regions. The excitation bands at 395 nm (7F05L6) and 465 nm (7F0 → 5D2) are found to be stronger than the CTB for Eu3+:YCZ nanophosphor, which match very well with the emission wavelength of commercial InGaN blue LED chip. Upon excitation to these wavelengths, a bright red emission from the 5D0 level of Eu3+ ion is observed with CIE chromaticity coordinates (0.65, 0.34), which are found to be very close to the National Television System Committee (NTSC) for red phosphor (0.67, 0.33).
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Document Type: Research Article

Publication date: November 1, 2013

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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