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采用静电纺丝与气相还原氮化相结合的方式制备了用于白光LED远场封装的Ca0.95Si2O2N2∶Eu0.052+带状荧光纤维.通过调节纺丝溶液的配比,得到了带状结构的Ca-Si-O-Eu前驱体纳米纤维和Ca0.95Si2O2N2∶Eu0.052+荧光纳米纤维.采用SEM、XRD、PL和HSP-3000 LED光谱测试系统等对材料进行了表征.微观上样品保持了带状纤维结构,宏观上以薄膜的状态存在,并具有一定的强度.样品在1250℃下保温4h后的XRD图谱与CaSi2O2N2的标准卡片相符合,Eu2+的掺杂没有改变CaSi2O2N2的晶相.在400 nm激发光的照射下,Eu2+掺杂的CaSi2O2N2带状纳米纤维在550nm附近呈现出一个较宽的来自于Eu2+的4f65d→4f7跃迁的发射峰.利用Ca0.95Si2O2N2∶ Eu2+带状荧光纤维膜和蓝光芯片远场封装的白光LED,具有较低的色温(4832 K),较高的显色指数(86)和流明效率(125 lm/W).

参考文献

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