研究目的
To overcome the shortcomings of insufficient red light component and poor thermal stability of commercial white light emitting diode (WLED) by preparing YAG:Ce, R (R: Gd3t and Pr3t) fluorescent thin films using pulse laser deposition (PLD) and investigating their composition, microstructure, photoluminescence properties, and red-enhanced mechanism.
研究成果
The Pr-Gd-Ce tri-doped YAG transparent fluorescent films successfully prepared by PLD showed a red-shift in the main peak position of the emission spectrum and an emission peak in the red-light region. The co-doping of Gd3t and Pr3t made the luminescence closer to the red region, warming the hue. This work provides inspiration for improving the red-light shortage of WLEDs using fluorescent films and transparent ceramics.
研究不足
The study acknowledges that the film is too thin (about 7.13 μm) and the transmitted blue light is too much, which affects the color coordinates of the film. It suggests further optimization of the film preparation process to increase the compactness and thickness of the YAG:Ce fluorescent film.
1：Experimental Design and Method Selection:
The study used pulse laser deposition (PLD) to prepare YAG:Ce, R (R: Gd3t and Pr3t) fluorescent thin films. The methodology included the synthesis of phosphor powders by ultrasonic co-precipitation mixed molten salt method and the preparation of transparent fluorescent thin films by PLD.
2：Sample Selection and Data Sources:
The samples were prepared based on the stoichiometric ratio of (Y1-xCex)3Al5O12, where x = 2%. The materials included Y(NO3)3?6H2O, Al(NO3)3?9H2O, Ce(NO3)3?6H2O, Gd2O, Pr6O11, HNO3, and NH4HCO
3：2%. The materials included Y(NO3)3?6H2O, Al(NO3)3?9H2O, Ce(NO3)3?6H2O, Gd2O, Pr6O11, HNO3, and NH4HCOList of Experimental Equipment and Materials:
3.
3. List of Experimental Equipment and Materials: Equipment included an ultrasonic cleaner, oven (DHG-9070 A, Yiheng, China), electric furnace (FSL-20, Ruiji, China), Nd:YAG laser device, X-ray powder diffraction analyses (XRD, D8 ADVANCE, Bruke, Germany), scanning electron microscope (SEM, S–3400N, Hitachi, Japan), energy dispersive X-Ray spectroscopy (EDS, Phoenix, Hitachi, Waltham, MA), FTIR-8300PCS (Shimadzu, Japan), fluorescence spectroscopy (F-7000, Hitachi, Japan), and UV–Vis spectrophotometer (UV-2550, Shimadzu, Japan).
4：Experimental Procedures and Operational Workflow:
The process involved the preparation of phosphor powders, the synthesis of doped phosphor powders, the preparation of transparent fluorescent thin films by PLD, and characterization of the films.
5：Data Analysis Methods:
The study analyzed the composition and microstructure of the films, their photoluminescence properties, and the energy transfer between co-doped ions.
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