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THERMAL ANNEALING AND SUBSTRATE NATURE EFFECTS ON STRUCTURAL PROPERTIES, MORPHOLOGICAL AND PHOTOLUMINESCENCE OF PLANAR .gif){kind=small}
THIN FILM PHOSPHORS DEPOSED BY SOL-GEL METHOD
Pages : [149] - [182]
Received : December 24, 2016; Revised January 13, 2017
Communicated by : Professor Mesfin Kebede.
Abstract
Intense red emission extracted from 
planar phosphor thin films have been successfully grown on different substrates such as Si (100), Si (111), and corning glass using spin-coating derived sol-gel deposition technique. The thin films are annealed at different temperatures. X-ray diffraction (XRD), FE-SEM, FTIR as well as steady and time resolved photoluminescence (PL) techniques were used to characterize the phosphor films. The cubic phase of 
is identified and it is found that the nano-particles sizes increase when increasing annealing temperature for Si (100), Si (111) substrates. Under UV excitation, the films show strong red emission at the 611nm assigned to forced electric dipole transition 
of 
in 
cite. The emission spectra also show the other intra-configurational transitions 
The PL excitation spectra show only the charge transfer energy from the 
to 
A blue-shift of the charge-transfer (CT) band in excitation spectra was observed in thin films compared with bulk 
Room temperature time-resolved emission spectra were measured; the variation of emission, decay time and refractive index with substrate nature and annealing temperature are discussed.
Keywords
thin film, nano-phosphor, spin-coating, photoluminescence.