Thin film of ZnAl2O4:Eu3+ synthesized by a non-alkoxide precursor sol-gel method

Abstract

) films were prepared by the dip-coating technique using a non-alkoxide precursor sol-gel method in ethanolic medium. Photoluminescence spectra displayed the main excitation bands at 270 and 393 nm. The emission spectra of the film heated at 500 ºC displayed bands at 578, 590, 612, 650 and 698 nm, assigned to the

Luminescent properties and X-ray photoelectron spectroscopy study of ZnAl2O4:Ce3+,Tb3+ phosphor

“…Zinc aluminate (ZnAl 2 O 4 ) is a well known semiconductor with a wide bulk band gap of 3.5-3.9 eV [1][2][3][4][5][6]. It belongs to a class of mixed-metal oxides called the spinels which are commonly represented by a general chemical formula AB 2 O 4 where A and B are divalent (2+) and trivalent (3+) cations, respectively.…”

Luminescence of (Mg,Zn)Al2O4:Tb mixed spinel thin films prepared by spin-coating

“…Amongst these techniques, sol-gel spin-coating is attractive due to its low cost, low temperature operation and environmental friendliness. [2][3][4] Moreover, sol-gel spincoating has been widely used in the development of optical materials for optoelectronic devices because it is easily controlled by varying some the growth parameters such as the spin speed, the viscosity of the solution and the annealing temperature.…”

Synthesis, characterization and studies of radiative properties on Eu3+-doped ZnAl2O4

“…For example, several transition metals and rare earth ions such as Mn 2 þ , Co 2 þ , Eu 3 þ , Dy 3 þ etc. can be incorporated into ZnAl 2 O 4 to harvest excellent phosphors [1,[5][6][7][8][9][10][11][12][13][14][15]. The optical band gap of polycrystalline ZnAl 2 O 4 semiconductors is 3.8 eV, which indicates that zinc aluminate in the polycrystalline form is transparent for light possessing wavelengths 4320 nm.…”

“…[3,[5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Nevertheless, luminescent properties are greatly dependent on the grain size, leading to attractive properties when the gain size decreases.…”

“…The optical properties of ZnAl 2 O 4 :Eu 3 þ hollow nanophosphors were studied by Baroos et al [8]. Photoluminescence (PL) as well as electro-luminescence studies on pure and impurities-doped ZnAl 2 O 4 phosphors are well reported in the literature [8][9][10]12,[14][15][16]. Lou and Hao [16] have reported cathodoluminescent properties and CIE chromatic coordinates on films Eu, Tb, Tm doped ZnAl 2 O 4 phosphors.…”