Photoluminescence of Erbium-Doped Potassium Tantalate Niobate Polycrystalline

Abstract

In this study, we investigated the luminescence properties of erbium-doped potassium tantalite niobate (KTa x Nb1-x O3 or KTN) ceramics, which were prepared by the conventional solid-state reaction synthesis method. In this work, we studied the relationships of the crystal structure, and Raman and photoluminescence (PL) spectra with the tantalum concentration, respectively. The experiments showed that the tantalum dopants modified the intensity of the green, red and near-infrared emission bands. The experiments also showed a blue shift for the 2 mol % erbium doped KTN samples with different tantalum compositions. Doping Ta not only led to the change in PL intensity but also in spectral shapes. The PL spectra showed the splitting peaks for the samples with low Ta compositions. Then these peaks combined and broadened as Ta concentration increase. When Ta was substituted for Nb completely, the luminescence intensity of the green emission band had an increase of approximately about one order of magnitude, which was because of the absence of the first-order phonon relaxation in the high-Ta-concentration samples.

Absorption and emission characteristics of Er3NbO7 phosphor: A comparison with ErNbO4 phosphor and Er:LiNbO3 single crystal

“…For the crystal, the polarized (p-and s-polarized) spectra are shown. The green emissions are associated with the two transitions 2 separated by a border around 540 nm. The red emissions are conducted with the 4 F 9/2 -4 I 15/2 transition.…”

Er³⁺ Upconversion Fluorescence of ErNbO₄ Phosphor for Optical Temperature Sensing

“…These erbium niobates include polycrystalline Er 3+ -doped KNbO 3 [1], polycrystalline [2], [3] and single-crystal [4] Er 3+ -doped potassium tantalate niobate (KTa x Nb 1−x O 3 ), singly Er 3+ -doped or doubly Er 3+ /Yb 3+ -doped trilithium niobate (Li 3 NbO 4 ) [5], ErNbO 4 [6] and Er 3 NbO 7 [7] phosphors, and Er 3+ -doped LiNbO 3 single-crystal [8]- [13]. Among them, the Er 3+ -doped LiNbO 3 (LN) single-crystal is a promising host material for integrated optical devices.…”