Synthesis, Structural and Luminescent Properties of Novel Eu3 +:Y2CaZnO5 Nanophosphor for White Light-Emitting Diodes
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 (7F0 → 5L6) 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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