Luminescence properties of novel Eu³⁺‐doped tantalate NaCaTiTaO₆ red‐emitting phosphors for solid‐state lighting

Abstract

A novel tantalate red‐emitting phosphors NaCa1‐xEuxTiTaO6 (x = 0.02‐0.50) is synthesized via the traditional solid‐state reaction sintering. The photoluminescence properties, X‐ray diffraction (XRD), scanning electron microscopy (SEM), and thermal stability are characterized in detail. Photoluminescence spectra show strong red emission monitored at 614 nm at λex = 395 nm. The spectral properties exhibit excellent color purity and chromaticity coordinate (CIE) characteristics. White light‐emitting diodes (w‐LEDs) device are fabricated by the prepared phosphors and show high quality of color‐rendering index. The investigated results suggest that the Eu3+‐doped NaCaTiTaO6 phosphors can be as potential substitute red phosphors for w‐LEDs.

In‐doped LiCa2.98MgV3O12 rare‐earth‐free phosphor with a high photoluminescence quantum yield of 67.4%

“…High-efficiency blue light-emitting materials have always been one of the important research directions in the LED field because they are the core materials for preparing ultraviolet chip-excited white LEDs (UV-type white LEDs). 7 Compared with the current blue-excited white LEDs, the UV-type white LEDs are more flexible in design, which can reduce blue light damage, improve color rendering index, reduce color decay, and improve thermal stability. One of the major directions in the development of white LED is indoor illumination applications.…”