Issue 39, 2013

Influence of neodymium-doping on structure and properties of yttrium aluminium garnet

Abstract

We study the impact of the Nd-doping on the grain formation, the crystal structure, and the fluorescence of the Yttrium Aluminum Garnet (YAG). The results show that Nd-doping leads to the YAG lattice expansion and distortion, and hence to an increase in defect concentration. This is attributed to substitution of larger Nd3+ ions for smaller Y3+ ions. As a result, the fluorescence intensity of Nd:YAG increases and reaches a maximum at 3 at% Nd. Above 3 at% Nd, the lattice distortion becomes more evident, and the Nd3+ ions segregate on the surface of grains and thus the fluorescence intensity decreases. Above 8 at% Nd, a large fraction of Nd3+ ions cannot enter the YAG lattice, but reside on the surface of grains instead, leading to formation of disordered clad layers. Above 10 at% Nd, a high degree of disorder in the structure is induced by the Nd3+ segregation both in the interior and boundary of grains. Above 15 at% Nd, Schottky and Frenkel defects appear due to the lattice distortion. In general, at Nd > 3 at% the Nd3+ segregation and concentration quenching cause the attenuation of the fluorescence of Nd:YAG.

Graphical abstract: Influence of neodymium-doping on structure and properties of yttrium aluminium garnet

Supplementary files

Article information

Article type
Paper
Submitted
04 Jun 2013
Accepted
07 Aug 2013
First published
08 Aug 2013

CrystEngComm, 2013,15, 8029-8035

Influence of neodymium-doping on structure and properties of yttrium aluminium garnet

X. Zhang, W. He, Y. Yue and Y. Zhang, CrystEngComm, 2013, 15, 8029 DOI: 10.1039/C3CE41006D

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