In this work, we synthesized the Tb3+ and Eu3+ doped α-Ba3Y(BO3)3 phosphor using the solution combustion method. Using the powder XRD pattern and FTIR low-temperature phase of α-Ba3Y1-X(BO3): xTb3+& Eu3+ was confirmed. Element composition with percentage was verified by FE-SEM-EDS. Stoke’s shift values were calculated which confirms the high thermal stability of the phosphor& its use in high power WLED. Photoluminescence study at room temperature was done. Intrinsic absorption due to the 4f-4f transition of Eu3+ results intense red emission from α-Ba3Y1-X(BO3): xEu3+ makes it suitable for pc-WLED and confirms the Centro-inversion symmetry site of Eu3+ in the host. Green emission at NUV excitation from Ba3Y1-X(BO3): xTb3+ results from cross-relaxation of Tb3+ in a host. The concentration quenching reason for both activators was investigated by calculating and comparing critical distance. The purity of luminescence color was confirmed by plotting CIE-chromaticity co-ordinates on CIE-Color gamut. The entire work confirms the importance of synthesized phosphor along with previously reported same host materials. The reported phosphor may be suitable for NUV converted WLED, wavelength conversion devices, and high power RGB –WLED.
The polycrystalline powder sample of Bi3+‐activated strontium yttrium borate phosphor Sr3Y1−x(BO3)3:xBi3+ (x = 3, 4, 5 mole%) is prepared by solution combustion technique. Formation of phosphor in the desired crystalline phase is confirmed by powder X‐ray diffraction characterization and FTIR, SEM images of the synthesized phosphor show the irregular grains with average particle size 2.5 µm. Luminescence properties of the synthesized phosphor are investigated at room temperature. The excitation spectrum consists of a single broad absorption band from 200 to 370 nm with the prominent excitation peak at 336 nm [1S0 to 3P1 of Bi3+ ions] and weak excitation peak at 254 nm [1S0 to 1P1 of Bi3+ ions]. Strongest emission peak of 492 nm wavelength that is of blue light is observed at 336 nm UV light excitation. Sr3Y1−x(BO3)3:xBi3+ phosphor emits blue light. As Bi3+ is sensitive to the surrounding crystal field environment it shows weak excitation peak at 254 nm, which gives emission at 413 nm. Hence, Sr3Y1−x(BO3)3:xBi3+ is new UV excited blue emitting phosphor useful for UV/blue chip WLEDs.
Sr3Y(BO3)3;Sr3Y0.98(BO3)3:0.02Ce3+;Sr3Y0.98(BO3)3:0.02Mn2+ Sr3Y0.96(BO3):0.02Ce3+0.02Mn2+phosphors are synthesized by solution combustion method at 650 °C in muffle furnace. Synthesized phosphors are annealed at 950 °C for 3 h under weak reducing atmosphere provided by activated charcoal/carbon to achieve desire oxidation state of dopants. Photoluminescence study shows that Sr3Y0.98(BO3)3:0.02Mn2+ phosphors converts blue light (462 nm) into red (614 nm) due to 4T1(4G) to 6A1(6s) transition of Mn2+ in host crystal. Sr3Y0.98(BO3)3:0.02Ce3+ converts UV radiation (261 nm: 2f5/2→5d1 of Ce3+) into blue light of wavelength 486 nm which is attributed to the inter‐configuration 5d1→4f1 transition of Ce3+. In Sr3Y0.96(BO3)3:0.02Ce3+ 0.02Mn2+ phosphors resonant energy transfer occurs from Ce3+ to Mn2+ in host matrix, resulting into intense red emission (614 nm) from UV light (263 nm). Using photoluminescence intensity comparison, the study confirms the resonant‐ET from sensitizer Ce3+ to activator Mn2+ in the crystal. So the report it as UV‐activated red emitting phosphor for UV‐PC‐WLED.
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