| Ce，Pr掺杂的YAG微晶玻璃的制备及光谱性能 | |
| Preparation and Luminescence Properties of Ce, Pr Doped YAG Glass Ceramics | |
| 摘要: 以Y2O3-A12O3-SiO2-Li2O-K2O-Na2O玻璃作为Ce，Pr掺杂基质玻璃，制备出白光LED用Ce∶YAG和Ce，Pr∶YAG微晶玻璃。使用X射线衍射仪、场发射扫描电子显微镜、荧光光度计对微晶玻璃的晶相、微观形貌、光谱性能及荧光寿命进行了研究。结果表明：掺杂铈或铈镨共掺杂的基质玻璃在1 400 ℃热处理得到YAG纯相；Ce∶YAG和Ce，Pr∶YAG微晶玻璃在466 nm有特征激发峰；在蓝光芯片激发下，Ce∶YAG微晶玻璃在480~700 nm产生有效发射，发射光谱中心波长531 nm，铈镨共掺微晶玻璃在609 nm有窄的发射峰，能提高LEDs的显色性。浓度掺杂实验表明镨的较佳掺杂浓度是Ce∶Pr为5∶6。Ce∶YAG和Ce，Pr∶YAG微晶玻璃的荧光衰减曲线表明：Ce∶YAG微晶玻璃荧光寿命比Ce，Pr∶YAG微晶玻璃长。 | |
| 关键词: 白光LED Ce，Pr∶YAG 微晶玻璃 荧光 | |
| 基金项目: | |
| Abstract: Using Y2O3-A12O3-SiO2-Li2O-K2O-Na2O as Ce-doping or Ce, Pr co-doping glass matrix, Ce∶YAG and Ce, Pr∶YAG glass ceramic for White-LED(WLED) was prepared by heat treatment of the glass matrix. The formation of YAG crystal phase, morphology, luminescence properties and lifetime were examined by X-ray diffraction (XRD), Field-emission scanning electron microscopy (FE-SEM) and photoluminescence spectroscopy. XRD analysis indicates that pure YAG phase is formed by heat treating at 1 400 ℃. Characteristic excitation peak located at 466 nm is observed in the excitation spectra of the Ce∶YAG or Ce, Pr∶YAG glass ceramic. A broad emission band from 480~700 nm, centered at 531 nm is produced with blue light excitation. A narrow emission peak is located at 609 nm in Ce, Pr∶YAG glass ceramic, which may improve the color rendering index(CRI)of WLED. Different Pr-codoping experiments show that the maximum is achieved with samples doped with the 5∶6(nCe∶nPr) ratio. Decay curves for the fluorescence of Ce∶YAG glass-ceramic test show that the lifetime of the Ce∶YAG glass ceramic is longer than that of the Ce, Pr∶YAG glass ceramic. | |
| Keywords: white LED Ce, Pr∶YAG glass-ceramic luminescence | |
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| 金怀东,向卫东,黄海宇,杨 帆,华 伟,董永军,梁晓娟.Ce，Pr掺杂的YAG微晶玻璃的制备及光谱性能[J].无机化学学报,2011,27(7):1285-1290. | |
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