Effect of Sr on the luminescence properties of Eu³⁺ activated xZnO-(1-x) SrO-Al₂O₃ phosphors

Abstract

Europium-doped xZnO-SrO-Al 2 O 3 (x = 0, 0.2, 0.4, 0.5, 0.6, 0.8, 1) phosphors were synthesized by the traditional Solid-State Reaction (SSR) method. The structure of the phosphors prepared was analysed with the x-ray diffraction technique. The xZnO-(1-x) SrO-Al 2 O 3 :Eu 3+ (0.1 mol%) (x = 0, 0.2, 0.4, 0.5, 0.6, 0.8, 1) exhibits varying PL intensity and is maximum for 0.8ZnO-0.2SrO-Al 2 O 3 : Eu 3+ (0.4 mol%) and hence treated as the most prominent phosphor among these combinations. In the photoluminescence spectrum of the phosphors prepared, a sequence of emission bands were visible at various wavelengths viz., 576, 586, 602, 620, 656 and 702 nm as a result of the transitions of Eu 3+ ions [ 5 D0 -7 Fj where (j = 0-4)] and an excitation spectrum at 620 nm. An efficient orange-red phosphor thus developed capable of yielding a quantum efficiency of about 12%. Studies revealed that the commercially available red phosphors having an efficiency of only 9.6% (λex = 394 nm) & 4.2% (λex = 395 nm). Hence the current sample could be an ideal alternative for an efficient phosphor near UV LEDs. The mechanoluminescence of the 0.8ZnO-0.2SrO-Al 2 O 3 : Eu 3+ (0.4 mol%) phosphor was also measured. The phosphor composition was analysed using XPS. The present paper also reports the thermoluminescence and OSL properties of Europium doped Zinc Strontium Aluminate phosphor at different gamma-ray dosages. Peak shape method was employed to evaluate kinetic parameters like activation energy, frequency factor and symmetry factor. OPEN ACCESS RECEIVED

Photoluminescence properties of europium-activated double layered perovskite Sr3Ti2O7 for high-quality lighting applications

“…The quantum yields of various other Eu 3+ doped phosphors are presented in Table 3. [40][41][42][43][44][45][46][47][48][49] The phosphor demonstrates a notable quantum efficiency of 18%. In comparison, the widely known-Eu 3+ doped Y 2 O 3 and YVO 4 phosphors have a higher quantum yield.…”

Mechanoluminescence and photoluminescence properties of Eu3+‐activated SrGa2O4 phosphors

“…The electrons present in the conduction band then recombine with the holes in the luminescence centre. There will be a chance for these ions to get trapped for a particular time in the trapping levels present near the conduction band [4][5][6]. In certain alkali halides, the ML glow curve consists of two peaks.…”

“…ML intensity increased with an increase in falling height, and maximum intensity was achieved at 25 cm. As the impact height was increased, the area of the fractured charged surface also increased, which enhanced the recombination luminescence [6,11]. As the height was increased the sharpness of the peak increased.…”

“…In recent years, the research field has imparted emphasis to ML materials in the areas of lighting devices, damage, and impact sensors, aerospace engineering, smart robotics, biomedicine, sensors for stress indicators, visualizations of stress distribution in solids and wireless fracture sensor systems and so forth [4,5]. The development in science and technology provides immense opportunities for scientists and engineers to synthesize and develop ML materials with excellent emission intensity and whose ML emission can be seen in daylight with the naked eye [6,7]. The recoverability, wireless detection, powerful light emission and nondestructive examination are only a few of the unusual qualities of ML materials [8].…”

“…The ML of gallate-based systems has been barely reported. Several authors have reported the ML properties of aluminates and silicates, especially the ML of SrAl 2 O 4 phosphors doped with rare earth ions [4][5][6][7][8]. To the best of our knowledge, the ML of the SrGa 2 O 4 phosphor activated with rare earth ions has not been reported until now.…”