研究目的
To realize the 490 nm single-peak emission for cirtopic light-emitting diodes (LEDs) by preparing a series of iso-structural (Sr1?xCax)1.97MgSi2O7:0.03Eu2+ phosphors with melilite structure.
研究成果
The (Sr1?xCax)1.97MgSi2O7:0.03Eu2+ phosphors can be applied as color-tunable phosphors for blue or green white light emitting diode based on ultraviolet chip/phosphor technology. Phosphors with x = 0.3 and x = 0.4 have potential value to be a cirtopic ingredient for white LEDs in the future due to their luminescent properties being more consistent with cirtopic vision.
研究不足
The quantum efficiency decreases with increasing Ca concentration. The preparation conditions, crystal defects, particle sizes, and morphology could further optimize the QE of the phosphors.
1：Experimental Design and Method Selection
Traditional solid-state reaction was used to prepare the phosphors. The phase purity was identified by x-ray diffractometer (XRD). Photoluminescence (PL) and photoluminescence excitation (PLE) spectra were measured by a fluorescence spectrometer.
2：Sample Selection and Data Sources
Specimens with the general formula (Sr1?xCax)1.97MgSi2O7:0.03Eu2+ (x = 0, 0.2, 0.3, 0.4, 0.8, 1) were prepared. All reagents used were AR grade.
3：List of Experimental Equipment and Materials
Bruker D8 ADVANCE diffractometer with Cu Kα radiation, Horiba Jobin-Yvon FluoroMax-3 fluorescence spectrometer, Orient KOJI instrument Co., Ltd QY-2000 integrating sphere coupled spectrofluorometer.
4：Experimental Procedures and Operational Workflow
The raw reagents were mixed thoroughly and fired at 1300 °C under a weak reducing atmosphere for 4 h. The samples were cooled to room temperature, ground, and then characterized.
5：Data Analysis Methods
The quantum efficiency was measured by an integrating sphere coupled spectrofluorometer. The emission spectrum was converted to the CIE 1931 chromaticity using the PL data and interactive CIE software.
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