Rare Earth Activated Phosphors Based on Yttrium Orthovanadate and Related Compounds

Abstract

The adoption of YVO4:normalEu as a new red ‐emitting primary in color television has stimulated investigation of a new class of phosphors obtained by appropriate substitutions in YVO4:normalEu . Substitution of Y3+ by Gd3+ and Lu3+ provides equally efficient hosts for Eu3 + with no significant spectral differences. Substitution of Y3+ by La3+ leads to a less efficient host with important differences in the emission characteristics of Eu3+. Use of rare earth activators ether than Eu3+ provides a series of phosphors which emit over most of the visible range. Spectral data and preferred concentration ranges are presented as well as the effect of temperature on the fluorescent emission intensities.

Hydrothermal synthesis and luminescent properties of YVO4:Ln3+ (Ln=Eu, Dy, and Sm) microspheres

“…Many synthetic routes have been developed to prepare YVO 4 doped with rareearth ions. For instance, high-temperature solid-state reaction is a conventional method, which is simple but has several disadvantages, such as high energy consumption and agglomeration of particles [13,14]. Compared with the conventional method, wet chemistry methods have been proved a more powerful technique for preparing single-phased and well-crystalline YVO 4 , such as sol-gel process [8,15], solution combustion synthesis [16], co-precipitation reaction [17], and low temperature hydrothermal methods [9,18,19].…”

Synthesis of lamp phosphors: facile combustion approach

“…There has been an increasing interest in rare-earth phosphors since 1980 as evidenced from the number of international conferences held [4][5][6][7][8], technical reports [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] and reviews [25][26][27][28][29][30][31][32][33][34][35] published. Phosphors activated by rare earth ions exhibit some peculiarities.…”

Determination of trace rare earth impurities in lutetium by x-ray excited optical luminescence

“…48'60 The t r a c e luminescence i n t h e v a n a d a t e i s much more int e n s e than i n t h e o x i d e s o r phosphates u s i n g e i t h e r UV 24 61s62 o r X-ray e x c i t a t i o n . Holmium, erbium, and thulium W e x c i t e d luminescence h a s been r e p o r t e d i n GdV04, [59][60][61] I n a d d i t i o n , W e x c i t e d y t t e r b i u m luminescence, p r e s e n t o n l y i n t h e 900.0 nun t o 1000.0 nm wave l e n g t h range, was found i n S C V O~ , 63 and L U V O~.~~ A l l f o u r a n a l y t e s luminesce as t r a c e i m p u r i t i e s i n YV04 under X-ray e x c i t a t i o n 2 4 and t h e r e f o r e , l u t e t i u m vanadate would' seem t o b e a p o s s i b l e h o s t .…”