Luminescent properties of rare earth (Er, Yb) doped yttrium aluminium garnet thin films and bulk samples synthesised by an aqueous sol–gel technique

Synthesis and upconversion luminescence properties of monodisperse Y2O3:Yb, Ho spherical particles

“…After calcining at 800 • C for 1 h, the peaks at 1080, 850 and 733 cm −1 disappear, and the sharp peak at 565 cm −1 associated with the vibration of Y-O is observed, indicating the formation of Y 2 O 3 [23]. Moreover, as the particle size decreases to nanometer range, due to the high surface-to-volume ratio, large amount of H 2 O and CO 2 in atmosphere is absorbed on the surface of particles to form CO 3 2− and OH − . Thus the bands around 3390, 1520 and 1400 cm −1 in calcined powder gradually strengthen along with the decrease of particle size.…”

“…1(a) under a high energy electron beam of TEM. This variation can be explained as follows: the higher the urea concentration, the greater the amount of CO 3 2− and OH − hydrolyzed by urea and the larger supersaturation in solution will be. As a result, the nucleation density is increased and the aggregating of the primary particles is accelerated.…”

“…There exists a great deal of interest in the trivalent rare-earth ions doped upconversion luminescence (UCL) materials because of their potential application in the fields of solid state laser, laser antiforgery, full color displays, fluorescent biological labels and so on [1][2][3][4]. Among the trivalent rare-earth ions, Ho 3+ -Yb 3+ is a much efficient UCL system [4][5][6][7][8][9].…”

Modified Pechini Synthesis of Oxide Powders and Thin Films

“…Already in 1980 Robertson and van Tol demonstrated that epitaxial luminescent films of rare earth-doped garnets could withstand much higher power densities in cathode ray tubes without degradation than their powder counterparts (Robertson and Van Tol 1980). Since then, thin film phosphor materials have received significant attention (Choe et al 2001;Garskaite et al 2010). The uniform thickness and smoother surface of the thin films makes it possible to define smaller pixels, thereby giving a higher resolution.…”

Sol–gel synthesis, characterization and study of substitution effects in different gallium-containing garnets

“…The most popular garnet is yttrium aluminium garnet (Y 3 Al 5 O 12 , YAG) which possesses good thermal, chemical stability and doped with transition metal or lanthanide ions could be employed as the host material for multi-coloured phosphors [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. By selecting corresponding lanthanide ions may be produced red, green and blue (RGB) emission for use in tricolour white light [25][26][27].…”