Red, green and blue photoluminescence of erbium doped potassium tantalate niobate polycrystalline

Crystal Growth of a New Series of Complex Niobates, LnKNaNbO5 (Ln = La, Pr, Nd, Sm, Eu, Gd, and Tb): Structural Properties and Photoluminescence

“…To achieve room temperature photoluminescence, most oxides have to be activated with a photoluminescent ion, such as a trivalent lanthanide, ,,, trivalent bismuth, or a combination of ions. , Photoluminescence activated by doping is strongly dependent on the dopant level, and concentration quenching is typically observed when doping levels exceed 5−10%. ,,,, Interestingly, our materials contain a rare earth ion fully occupying a specific crystallographic site within the structure. This 100% presence might be expected to result in concentration quenching, which, however, clearly is not the case for the materials reported herein.…”

“…Niobium-containing oxides comprise a large group of compounds with distinct structures that exhibit a wide range of interesting physical properties, such as high dielectric constants, − photocatalytic behavior, − and photoluminescence. ,,− As a result of the increased interest in fabricating high quality, energy efficient light-emitting diodes (LEDs), complex photoluminescent oxides are increasingly being investigated. The main focus has been on doping such complex oxide structures with rare-earth-metal ions to achieve enhanced luminescent behavior via the rare earth cations, where the niobate structures influence the likely f−f and f−d transitions responsible for photoluminescence. ,,, These optical properties are greatly dependent on the composition and, perhaps more importantly, on the details of the material’s crystal structure. For these reasons there has been a push to prepare new niobate materials with new crystal structures and, thus, potentially new or enhanced properties.…”

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.…”

Spectroscopic and upconversion properties of Er3+/Yb3+-codoped KLTN single crystal

“…However, the basic spectroscopic properties of RE ions doped KLTN single crystal have seldom been investigated. As far as we know, only the photoluminescence properties of Er 3+ doped potassium tantalate niobate polycrystalline materials were reported by Wen et al [13]. So, it is of great significance to grow the KLTN single crystal doped with RE ions and to study its luminescent properties considering its extensive research and application prospects for the UC luminescent properties.…”