Concentration dependence of UV and electron-excited Tb3+ luminescence in Y3Al5O12

Abstract

The emission spectrum of Tb3+ substituted in YAG to various concentrations (x in Y3−xTbxAl5O12 ranges from 3×10−5 to 3×10−1) has been measured on samples prepared by two different methods. These methods are powder preparation by coprecipitation and growth of crystalline layers by liquid-phase epitaxy. The spectrum consists of two groups of lines, one group around 550 nm originating from the 5D4 level and one group around 450 nm from the 5D3 level. The intensity of the two groups of lines depends on the method of excitation. In the case of UV excitation (λ=254 nm) the emission intensity for low Tb concentrations is mainly governed by the absorption of the incident radiation. With electron excitation, the energy loss of incoming electrons to ‘‘killer sites’’ in the lattice is found to influence the emission. The ratio, however, of 5D4 to 5D3 intensity is independent of the excitation mode. This ratio tends to a constant value at low concentrations and increases strongly with increasing concentration. These effects are explained by feeding of the 5D3 and 5D4 states from 5d levels, followed by cross relaxation, i.e., 5D3 to 5D4 excitation transfer.

Crystal chemistry of BaCa2Ln6O12 (Ln  In, Sc, Y, Dy, Ho, Er, Tm, Yb, Lu) and luminescence of europium- and terbium-activated BaCa2Y6O12

“…2(b)). The ratio of the total integrated intensity from the 'De level to that of the 5D3 level is about 3, which is the same value as reported for Y,Al,O,,:Tb [28]. For the sample containing 5% terbium, these 5D3 -+ 7FJ emissions are no longer observed due to cross-relaxation between Tb3+ ions.…”

Parallel Solution Combustion Synthesis for Combinatorial Materials Studies

“…24 The dependence of the branch ratio on the Tb concentration has been extensively studied and is well-explained with the cross-relaxation theory. 22,25 This dependence can be used as intrinsic evidence of the phase formation and uniform doping. The quantitative agreement indicates that the designed materials are synthesized successfully, and the parallel SC microreactions can be applied to a combinatorial study of high-temperature materials.…”

Rare‐earth Based Insulating Nanocrystals: Improved Luminescent Nanophosphors for Plasma Display Panels

“…Kang et al [41] reported that the particle size, shape, crystallinity, defects etc significantly affects the luminescence characteristics of YAG:Tb 3+ . Whereas, Van der Weg et al [42] studied the effect of doping concentration on the luminescence behavior of YAG:Tb 3+ . They observed that at low doping concentrations, primarily the absorption of excitation wavelength affects the luminescence characteristics without having any direct effect of the process of cross relaxation favoring emission from 5 D 3 state, whereas, at higher concentration the cross relaxation process favors the emission from 5 D 4 state.…”