研究目的
Investigating the efficient blue-white color luminescence with near-ultraviolet excitation in Dy3t/Tm3t:Na3Gd(PO4)2 nanophosphor for white LEDs.
研究成果
The Dy3t/Tm3t co-activated Na3Gd(PO4)2 nanophosphors exhibit tunable emission from blue to white region under near-UV light irradiation, with efficient energy transfer from Dy3t to Tm3t. The CIE coordinates and color purity suggest potential applications in near-UV white LEDs.
研究不足
The study focuses on the synthesis and characterization of Dy3t/Tm3t:Na3Gd(PO4)2 nanophosphors for white LEDs, but the practical application in LED devices and long-term stability under operational conditions are not addressed.
1：Experimental Design and Method Selection:
The Dy3t/Tm3t ions co-activated Na3Gd(PO4)2 phosphors were synthesized by the citrate-gel based combustion technique. The structural properties were studied through XRD and FT-IR. The influence of Tm3t concentration on the fluorescence properties was investigated under near-UV light irradiation.
2：Sample Selection and Data Sources:
High-purity Na2CO3, Gd2O3, NH4H2PO4, Dy2O3, Tm2O3, and C6H8O7 (citric acid) from Sigma Aldrich were used as starting materials.
3：List of Experimental Equipment and Materials:
Siefert diffractometer with Cu Kα radiation source for XRD, Shimadzu IRAffinity-1 for FT-IR, and Jobin Yvon Fluorolog-3 spectrofluorimeter FS5 spectrometer for PLE, PL spectra, and lifetime measurements.
4：Experimental Procedures and Operational Workflow:
The citrate-gel based combustion technique was used for synthesis. The gel was dried and then introduced into a pre-heated furnace at 900°C. The obtained nanophosphor was characterized.
5：Data Analysis Methods:
The energy transfer efficiency and critical distance were calculated using Dexter’s energy transfer formula and Reisfeld’s approximation.
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