宽带绿色荧光粉(Lu_(0.99-x)La_(x)Bi_(0.01))_(2)WO_(6)的制备、光致发光及性能调控  

Preparation,Photoluminescence and Properties Regulation of Broad Band Green Phosphors(Lu_(0.99-x)La_(x)Bi_(0.01))_(2)WO_(6)

作　　者：龚长帅 薛绪岩 王渤文 王建通 冯晓雯 王雪娇 Gong Changshuai;Xue Xuyan;Wang Bowen;Wang Jiantong;Feng Xiaowen;Wang Xuejiao(School of Chemistry and Materials Engineering,Bohai University,Jinzhou 121013,China)

机构地区：[1]渤海大学化学与材料工程学院,辽宁锦州121013

出　　处：《稀有金属》2024年第3期355-364,共10页Chinese Journal of Rare Metals

基　　金：辽宁省自然科学基金项目(2020-MS-286)资助。

摘　　要：宽带绿光荧光粉在克服荧光粉转换白光LED(pc-WLED)蓝绿(青色)470~510 nm波段的缺失问题,实现高显色指数白光照明中有重要应用。采用普适的高温固相法合成一种以Bi^(3+)为激活剂的发射宽带绿光荧光粉(Lu_(0.99)Bi_(0.01))_(2)WO_(6)。采用共掺杂La^(3+)的策略对(Lu_(0.99-x)La_(x)Bi_(0.01))_(2)WO_(6)(x=0~0.25)系列荧光粉的物相、形貌及发光性能进行调控,并采用X射线衍射(XRD)、Rietveld精修、场发射扫描电子显微镜(FE-SEM)、X射线光电子能谱(XPS)及光致发光等检测手段对样品进行了研究。结果表明,La^(3+)掺杂可显著提高(Lu_(0.99-x)La_(x)Bi_(0.01))_(2)WO_(6)样品的结晶性(x≤0.10)及发光强度,并在x>0.20时开始发生相变。La^(3+)掺杂对样品的微观形貌有显著影响,得益于La^(3+)掺杂获得了尺寸均匀分散性较好的微米棒形貌。在346 nm波长激发下,(Lu_(0.99-x)La_(x)Bi_(0.01))_(2)WO_(6)样品在400~800 nm范围内呈现出宽带绿色发射,半峰宽(FWHM)可达135 nm,最强峰位于515 nm处,对应于Bi3+的3P1→1S0跃迁。荧光粉呈现宽带激发,激发范围覆盖了200~400 nm的波长区域,与商用紫外LED匹配良好。采用所得的宽带绿光荧光粉(Lu_(0.94)La_(0.05)Bi_(0.01))_(2)WO_(6)与商用CaAlSiN_(3):Eu^(2+)红色荧光粉、BaMgAl10O17:Eu2+蓝色荧光粉及365 nm商用芯片制作出具有较高的显色指数(R,Ra=93,R1~R15均大于80),较低色温(相关色温(CCT)=3928 K)的暖白光pc-LED器件,表明(Lu_(0.99-x)La_(x)Bi_(0.01))_(2)WO_(6)荧光粉在高质量的暖白光LED照明方向有较大的应用潜力。Phosphor conversion LEDs(pc-LEDs)have many advantages and have been widely used as green lighting sources.At present,the most common strategies to realize white lighting is to coat YAG:Ce^(3+)yellow phosphor on blue LED chip,or combine tricolor(RGB)phosphor with near ultraviolet chip(nUV-LED).The chip production process is relatively mature,and the phosphor plays a key role in pc-LED,which largely determines the performance of the device.Due to the lack of a cyan(470~510 nm)spectral component between the PL spectra of blue and green phosphors,the obtained pc-WLEDs have a low color rendering index(CRI,70~80),which limits their wide applications in general lighting.Thus,developing ultraviolet or blue light excitable cyan-emitting phosphors becomes a logical-led solution,and the color rendering index of a pc-LED device incorporating a cyan phosphor can indeed be improved in this way.However,using multiple phosphors will lead to fabrication complexity and reabsorption.Broadband green phosphors have important applications in overcoming the lack of blue-green(cyan)470~510 nm spectra range in phosphor-converted white LED(pcWLED)and achieving high color rendering index white lighting.Bismuth is an element with multiple valence states(Bi^(0),Bi^(1+),Bi^(2+),Bi^(3+),Bi^(5+)).The electronic configuration of Bi^(3+)is[Xe]4f^(14)5d^(10)6s~2,which is relatively stable.The 6s electrons of Bi^(3+)are easily affected by the surrounding environment,so the emission and excitation positions of Bi^(3+)doped phosphors strongly depended on the covalence of the surrounding crystal field and the matrix lattice.Therefore,the tunable emission of Bi^(3+)can be precisely realized by adjusting the matrix composition and crystal structure.In this work,a broadband green phosphor(Lu_(0.99)Bi_(0.01))_(2)WO_(6) was synthesized by a high-temperature solid-state method,and co-doping La^(3+)was adopted to regulate the phase,morphology,and luminescence performance of(Lu_(0.99-x)La_(x)Bi_(0.01))_(2)WO_(6) phosphors.The phase,composition,and microstruct

关 键 词：Bi^(3+)发光 稀土钨酸盐 宽带发射 光致发光 

分 类 号：O614.33[理学—无机化学]