Structural refinement, band-gap analysis and optical properties of GdAlO3 nanophosphors influenced by Dy3+ ion concentrations for white light emitting device applications. (7th April 2016)

• Record Type: Journal Article
• Authors: Jisha, P K; Naik, Ramachandra; Prashantha, S C; Nagaswarupa, H P; Nagabhushana, H; Basavaraj, R B; Sharma, S C; Prasad, Daruka
• Is Part Of: Materials research express. Volume 3:Number 4(2016)
• Publication Date: 2016-04-07
• Subjects: GdAlO3:Dy3+ -- combustion technique -- nanophosphor -- photoluminescence -- Judd–Ofelt -- CIE; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/3/4/045007
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: Nanosized GdAlO3 phosphors activated with Dy 3+ were prepared by a combustion method. Synthesized phosphors were calcined at 1000 °C for 3 h in order to achieve crystallinity. Powder x-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM) analysis was used to characterize the prepared product. The orthorhombic phase was observed in the XRD pattern. The particle size of the samples was calculated as around 25 nm. The SEM images show an irregular shape of the prepared nanophosphor. Functional groups of the phosphors were examined by Fourier transform infrared (FTIR) spectroscopy. Photoluminescence (PL) properties of Dy 3+ doped GdAlO3 for near-ultraviolet excitation (352 nm) were studied in order to investigate the possibility of its use in white light emitting device applications. Judd–Ofelt intensity parameters, radiative transition rate ( A T ) and radiative lifetimes ( τ rad ) were evaluated from the emission spectrum by adopting a standard procedure. The Commission International de l'Eclairage (CIE) color coordinates and correlated color temperature (CCT) are studied for the optimized phosphor. It is found that the color coordinates of Dy 3+ doped GdAlO3 powders fall in the white region of the CIE diagram, and the average CCT value was found to be about 6276 K. Therefore, the present phosphor is highly useful for display applications.