BaLaGa_(3)O_(7):Bi^(3+)荧光粉的制备及发光性能研究  

Synthesis and Luminescent Properties of BaLaGa_(3)O_(7):Bi^(3+) Phosphors

作　　者：梁冬宝 张瑞[1] 申玉芳[1] 张建 LIANG Dongbao;ZHANG Rui;SHEN Yufang;ZHANG Jian(Key Laboratory of Nonferrous Materials and New Processing Technology,Ministry of Education,Guangxi Key Laboratory of Optical and Electronic Materials and Devices,College of Materials Science and Engineering,Guilin University of Technology,Guilin,Guangxi 541004,China)

机构地区：[1]桂林理工大学材料科学与工程学院,广西光电材料与器件重点实验室,有色金属及材料加工新技术教育部重点实验室,广西桂林541004

出　　处：《光子学报》2022年第3期329-337,共9页Acta Photonica Sinica

基　　金：国家自然科学基金(No.52062008);广西自然科学基金(No.2018GXNSFAA050021)。

摘　　要：采用高温固相法合成了BaLa_(1-x)Ga_(3)O_(7):x Bi^(3+)(0.01≤x≤0.13)系列荧光粉。X射线衍射数据和Rietveld精修结果表明,BaLa_(1-x)Ga_(3)O_(7):x Bi^(3+)荧光粉具有黄长石结构。扫描电镜图像显示,荧光粉的颗粒为不规则形状,尺寸在5~30μm之间。漫反射光谱表明,BaLaGa_(3)O_(7)基体对于Bi^(3+)离子掺杂发光具有合适的光学带隙。在348 nm紫外光激发下,BaLa_(1-x)Ga_(3)O_(7):x Bi^(3+)荧光粉呈现出中心波长位于475 nm的宽带发射。随着Bi^(3+)离子掺杂浓度增加,荧光粉的发射强度出现先增加后减少的趋势,该浓度猝灭发光现象源于偶极-偶极相互作用。其中,BaLa_(0.89)Ga_(3)O_(7):0.11Bi^(3+)荧光粉的发射强度达到最大,量子产率为19.2%,且在150℃时的发射强度仍能保持25℃时的69.2%,说明BaLa_(1-x)Ga_(3)O_(7):x Bi^(3+)荧光粉在近紫外激发白光LED领域具有潜在的应用价值。At present,with the increasingly serious environment and energy,the research and development of green and low energy consumption technology has attracted extensive attention.In the field of lighting,as a green light source in the 21st century,phosphor-converted White Light-Emitting Diodes(WLEDs)are expected to become an indispensable generation of comfortable and healthy lighting system due to its obvious advantages of high luminous efficiency,low environmental pollution and low energy consumption.The two key materials for commercially available WLEDs are yellow YAG:Ce phosphors and blue LED chips.In this scheme,the lack of red component results in only a low color rendering index(<80),high related color temperature(>4500 K)cold white light,which are not conducive to the application of indoor lighting.Generally speaking,adding efficient red phosphors on this basis can obtain a higher color rendering index and a lower color temperature.However,one of the costs of adding such phosphors is that the device becomes significantly less efficient.From a more comprehensive and humanized perspective,the combination of ultraviolet LED chip with red,blue and green phosphors has undoubtedly attracted the attention of the majority of scientific researchers.As far as we know,rare earth ions(such as Eu^(2+)and Ce^(3+))are used as activators for most of the phosphors that can be excited by ultraviolet LED chips and tricolor phosphors in the lighting scheme.However,the mixture of three primary phosphors can easily cause spectral reabsorption.In addition,an imbalance between supply and demand makes rare earths expensive,which is a major impediment to their commercialization.In view of this situation,choosing phosphors with non-rare earth ions as activators can effectively solve the above problems of rare earth doped phosphors.Nowadays,as another type of activator,bismuth(Bi),has been extensively studied and reported because of the potential optical properties related to the strong interaction with surrounding coordination environme

关 键 词：Bi^(3+)离子 镓酸盐 荧光粉 发光性能 白光LED 

分 类 号：O482.31[理学—固体物理]