Single phase multi color emitting Ca₂LuTaO₆: Dy³⁺/Eu³⁺ double perovskite oxide phosphors

Abstract

The trivalent rare‐earth (RE3+) doped phosphors show tremendous achievement in narrow band multicolor line emission for various applications. However, the 4f–4f absorption transition of these ions is forbidden in UV and blue light excitation. Usually, a sensitizer having spin allowed transition was used as a co‐dopant to excite these ions via the energy transfer phenomenon. Another approach promisingly using to excite these ions by efficient energy transfer from the intrinsic emission of the Ca2LuTaO6 double perovskite phosphors host lattice. Phosphors of Ca2LuTaO6 with double perovskite structure were synthesized by using a high‐temperature solid‐state reaction method. The produced Ca2LuTaO6 double perovskite phosphors show an intrinsic broad band emission centered at 424 nm under the excitation of 313 nm UV light. The origin of this broad band blue emission was deeply investigated by using computation and experimental approaches. The trivalent activator Dy3+ and Eu3+ were doped is a single and co‐dopant in the produced Ca2LuTaO6 phosphors to check their excitation in UV and near‐UV spectral region. X‐ray diffraction and scanning electron microscopy were used to investigate the structure and phase analysis. Various characterizations such as photoluminescence excitation, emission, and CIE chromaticity coordinates were measured which illustrate the potential of Dy3+ and Eu3+ activated Ca2LuTaO6 double perovskite phosphors for narrow band multicolor line emission for various applications.

Tb3+/Sm3+ co-doped double perovskite: synthesis, exfoliation and luminescence properties

“…[12][13][14][15] Rare-earth ions, with special and various 4f energy levels, have been widely used in multicolour perovskite nanomaterials. [16][17][18] Ultrathin nanosheets, with extremely large planar geometry, are promising building blocks for optical devices. 19 , were synthesized successfully by soft-chemistry exfoliation methods and the exfoliated nanosheets showed enhanced emissions due to the enhanced energy-transfer between host layers and activators.…”

“…Rare-earth ions, with special and various 4f energy levels, have been widely used in multicolour perovskite nanomaterials. 16–18 Ultrathin nanosheets, with extremely large planar geometry, are promising building blocks for optical devices. 19 Thus, rare-earth-doped perovskite nanosheets may be potential multicolour device materials.…”