Abstract
A new orange-red emitting praseodymium doped cubic CeO2 phosphor powders were fabricated via simple green combustion route utilizing Aloe vera gel as fuel. The prepared powders structural, morphological and optical properties were studied in detail. From the Rietveld refinement technique the powder X-ray diffraction (PXRD) matching profile was simulated and the cubic crystal diagram was depicted with the help of Diamond 2.0 software. The morphology of the prepared powders was studied with variation of the bio-fuel Aloe vera gel. The particle size was calculated by means of Transmission electron microscope (TEM) and it was found to be ~250 nm. Fourier transform infra-red spectral (FTIR) studies reveal the strong stretching vibrations between the molecules. The optical energy band gap (Eg) of the prepared powders was estimated by utilizing the diffuse reflectance spectral (DRS)studies. The Eg values were found to be in the range of 3.33–3.46 eV. The photoluminescence (PL) excitation spectra were recorded in the range 350–600 nm. Among the observed peaks the intense one was found at 463 nm corresponds to 3H4→3P2 transition. The PL emission spectrum shows a prominent orange emission peak centered at 608 nm along with weak intense peak at 650 nm corresponds to 3P0→3H6 and 3P0→3F2 transitions of Pr3+ ions respectively. The PL intensity upsurges upto 5 mol% of dopant concentration and thereafter it decreases due to concnetration quenching phenomena. The CIE color coordinates were estimated for optimum concentration (0.594, 0.379) and which falls in the orange-red region of the chromaticity map. The average correlated color temperature (CCT) was also assessed and it was observed to be ~6046 K, specifies that the fabricated nanopowders can be used as cool LED sources such as household lighting applications. The color purity was found to be 97% for optimum powders. The QE efficiency of prepared samples were found to be 86%. These combined results indicate that the fabricated phosphor powders can be efficiently utilized as orange-red component in the fabrication of white light illuminating devices.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
