不同方法制备Y_3Al_5O_(12)∶Ce^(3+)黄色荧光粉的对比研究（英文）

Contrastive Research of the Y_3Al_5O_(12):Ce^(3+) Yellow Phosphors Prepared by Different Methods

分别以高温固相法、溶胶-凝胶法和水热-热解法制备了Ce^(3+)掺杂的YAG黄色荧光粉,通过X-射线衍射(XRD)、场发射扫描电镜(FESEM)及荧光光谱(PL)进行表征,考察YAG∶Ce^(3+)黄色荧光粉的晶相、形貌及发光性能对制备方法的依赖性。实验表明,三种方法都实现了Ce^(3+)取代Y^(3+)的位置进入晶格,Ce^(3+)掺杂的YAG荧光粉在晶体结构上都保持立方晶体结构。高温固相法所得样品为不规则球形,粒径尺寸较大;溶胶-凝胶法所得样品为纳米尺度范围,细小颗粒团聚严重,水热-热解法所得样品形貌为球形结构且分散性较好,粒度在10μm左右。荧光光谱显示,三种样品都可被460 nm蓝光有效激发,在550 nm处产生宽带发射,但样品发光强度及量子效率差异较大,该现象主要是由样品形貌及粒径尺寸的差异引起的。

Ce3＋ doped Y3 Al5 O12 ∶Ce3＋ yellow phosphors are prepared by the high-temperature solid-state method,sol-gel method and hydrothermal-pyrolysis methods.The influences of the preparation methods on the phase,morphology and photoluminescence properties of the YAG∶Ce3＋ yellow phosphors are investigated by XRD,FESEM and PL,respectively.The results indicate that the three methods all realize the substitution of Ce3＋ ions for Y3＋ ions,and that the cubic crystalline structure of the Ce3＋-doped YAG phosphors is un-changed.The samples prepared by the high-temperature solid-state method present an irregular sphere-like morphology,with a large sample size;the sol-gel method produces nanoparticles with a notable particle ag-glomeration;and the samples prepared by the hydrothermal-pyrolysis method present a well-distributed sphere-like structure with a diameter of 10μm.According to the fluorescence spectrum,the three samples are excited by blue light with a wavelength of 460 nm,and a big broadband emission at 550 nm is observed.How-ever,due to the differences in the morphology and size,these samples present very different luminous intensi-ties and quantum efficiencies .