Effects of monovalent cation doping on the structure and photoluminescence of GdAlO₃:Eu³⁺ phosphor
by R. Venkatesh; N. Dhananjaya; C. Shivakumara
International Journal of Nanotechnology (IJNT), Vol. 14, No. 9/10/11, 2017

Abstract: Monovalent cations such as Li (1 mol%) co-doped in GdAlO₃:Eu³⁺ phosphors were synthesised by solution combustion technique using oxalyl dihydrazide (ODH: C₂H₆N₄O₂) as a fuel. X-ray diffractometer (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR) and photoluminescence (PL) techniques have been employed to characterise the synthesised nanoparticles. All the compounds crystallised are in the pure orthorhombic phase with no impurity peak. SEM showed the porous, agglomerated and irregular shaped crystallites. The crystallite size was calculated by the Debye Scherrer's method and was found to be in the range 40-45 nm. Photoluminescence (PL) measurements were carried out for GdAlO₃:Eu³⁺ and GdAlO₃:Eu³⁺, Li⁺ phosphors. The characteristic emission peaks of Eu³⁺ ions were recorded at 590 and 597, 615 and 627, 650 and 695 nm corresponding to ⁵D₀ → ⁷F_J (J = 1, 2, 3, 4) transitions respectively. The PL intensity of GdAlO₃:Eu³⁺ phosphor was improved evidently by co-doping with Li⁺ ions whose radius is less than that of Gd³⁺. The effect of co-dopant on enhanced luminescence was mainly regarded as the result of a suitable local distortion of crystal field surrounding the Eu³⁺ activator. These results will play an important role in seeking some more effective co-dopants. The CIE colour coordinates values of these phosphors are determined using CIE 1931 standard. These phosphors can act as a potential candidate in white LEDs and solid state lighting applications.

Online publication date: Sun, 24-Sep-2017

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