稀土離子活化紅光螢光粉之製備與發光特性研究

Abstract

本論文以開發新穎稀土離子螢光材料並探討其合成方法、發光特性與機制並評估應用於白光發光二極體之潛力。本論文以固態反應法成功合成Ca2Y8Si6O26:Sm3+、BaY2Si3O10:Sm3+與La5BSi2O13:Sm3+螢光粉，利用X光繞射、掃描式電子顯微鏡、螢光光譜儀、變溫光譜儀、色度座標等進行晶體結構、表面形態、發光特性、熱穩定性與色度座標等進行分析。Sm3+為f-f禁止躍遷，本實驗結果顯示在300 nm-500 nm有多處吸收窄波峰，有利於紫外光與藍光晶片封裝。本研究在550 nm與700 nm波長之間有多處放射峰，Ca2Y8Si6O26:Sm3+最強放射峰為648 nm，BaY2Si3O10:Sm3+最強放射峰為602 nm，La5BSi2O13:Sm3+最強放射峰為602 nm，上述螢光粉皆放射出橘紅光。本論文將上述紅光螢光粉分別與BaMgAl10O17:Eu2+藍光商用螢光粉和(Ba,Sr)2SiO4:Eu2+和用螢光粉搭配390 nm波長N-UV晶片進行白光LED封裝，探討其發光特性、色溫。

In this study, we successfully prepared the novel fluorescent materials and discussed their synthesis methods, luminescence properties and luminescent mechanism to apply to white light emitting diodes. The high temperature solid state method was used to synthesize the new phosphors, Ca2Y8Si6O26:Sm3+, La5BSi2O13:Sm3+, and BaY2Si3O10:Sm3+ with different calcination temperature. The X-ray diffraction, Electron microscopy, fluorescence spectrometer, temperature analyzer, chromaticity coordinates were used to analyze the crystal structure parameters, surface morphology, luminescent properties, fabrication performance, thermal stability and so on. The rare earth ions Sm3+ belong to the f-f forbidden transition, and the experimental results showed that there were multiple absorption narrow peaks appear ranged from 300 nm to 500 nm, which covered with the ultraviolet light and blue chip package. The strongest emission peak of Ca2Y8Si6O26:Sm3+ is locating at 648 nm, the strongest emission peak of BaY2Si3O10:Sm3+ is centered at 602 nm, and the strongest emission peak of La5BSi2O13:Sm3+ is near to 602 nm, and the phosphors are shot out of orange light. In this paper, the red light phosphors were packaged with BaMgAl10O17:Eu2+ blue commercial phosphor and (Ba, Sr)2SiO4:Eu2+ respectively with current red-emitting phosphors with a 390 nm wavelength N-UV light to investigate its luminescent properties.