Luminescence properties of Bi3+-Activated double perovskite tungstate Ba2GdWO6 phosphors

Double perovskite-type fluorescent materials Ba 2 GdWO 6 : x %Bi 3+ ( x  = 0.1∼2.0) were successfully prepared via a high-temperature solid-state reaction method, which possesses dual functional characteristics of photoluminescence (PL) and thermoluminescence (TL). Systematic characterizations revealed that when the Bi 3+ doping amount is 1%, the sample exhibits optimal PL performance under near-ultraviolet excitation. At an excitation wavelength of 382 nm, the typical blue emission peak of Bi 3+ shows a quantum efficiency of 51.14%, with CIE chromaticity coordinates of (0.155, 0.049), a color purity as high as 91.62%, a correlated color temperature (CCT) of 1721 K, and an activation energy of 0.228 eV. All these indicators meet the application standards of LED phosphors for plant growth.Thermoluminescence analysis indicated that the material exhibits an obvious TL peak around 390 K, and the optimal TL performance is achieved when the Bi 3+ doping concentration is 0.2%. Within the irradiation dose range of 0.266∼2.1 Gy, the TL intensity shows a good linear relationship with the dose, demonstrating its applicability for low-dose radiation detection. In addition, the samples after X-ray irradiation not only possess high linear responsiveness but also exhibit excellent thermal stability and radiation damage resistance.In summary, the double perovskite tungstate Ba 2 GdWO 6 : x %Bi 3+ achieves the synergistic optimization of light conversion and radiation response, and has important application value in the fields of plant lighting LEDs and radiation dose monitoring.