Cymbopogoncitratus assisted green synthesis of doped Yttrium nanopowder: Structural and Photoluminescence properties for wLEDs applications

Abstract For the first time green route was used to synthesize pure and Cr 3+ (1-11 mol %) doped Yttrium oxide (Y 2 O 3 ) nanostructures by using Cymbopogon citrates extract as a fuel. The prepared samples were well characterized by powder X-ray diffraction (PXRD), scanning electron microscopy, transmission electron microscopy, Diffused reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The PXRD results shows the formation of single phase, cubic structure of Y 2 O 3 with crystallite sizes ∼15 nm which was further confirmed by TEM results. The SEM results indicated various shaped nanostructures which solely dependent on the fuel concentration. The band gap energy was estimated by DRS and found to be in the range of 5.67 – 5.80 eV. PL results indicate intense sharp peak at ∼ 689 nm along with vibronic side bands 706 and 734 nm. The 689 nm peak was well known R – line and was assigned to the 2 E g → 4 A 2g transition of Cr 3+ ions.The CIE (Commission International de I'E' clairage) chromaticity coordinates were located in pure orange- red region. Further, (Commission International de I'E' clairage) CCT values were in the range 3387 – 3486 K. The studies indicate that Y 2 O 3 :Cr 3+ nanophosphors (NPs) were quite useful for display devices