发光颜色可调Cs_(3)Gd_(1-x-y)Lu_(y)Ge_(3)O_(9):xBi^(3+)固溶体荧光粉的制备和发光性质研究  

Preparation and Luminescence Properties of Color-tunable Emission Cs_(3)Gd_(1-x-y)Lu_(y)Ge_(3)O_(9):xBi^(3+)Solid Solution Phosphor

作　　者：康新威 戴鹏鹏[1] KANG Xinwei;DAI Pengpeng(Xinjiang Key Laboratory for Luminescence Minerals and Optical Functional Materials,School of Physics and Electronic Engineering,Xinjiang Normal University,Urumqi 830054,China)

机构地区：[1]新疆师范大学、物理与电子工程学院、新疆发光矿物与光功能材料研究重点实验室,乌鲁木齐830054

出　　处：《光子学报》2022年第12期262-270,共9页Acta Photonica Sinica

基　　金：国家自然科学基金(No.51762040);新疆维吾尔自治区杰出青年科学基金(No.2021D01E19);新疆师范大学矿物发光与微结构重点实验室研究基金(No.KWFG202208)

摘　　要：采用传统的高温固相法合成了一系列Cs_(3)Gd_(1-x)Ge_(3)O_(9):xBi^(3+)(0.02≤x≤0.1)蓝色荧光粉,并通过Lu^(3+)替代Cs_(3)Gd_(1-x)Ge_(3)O_(9)基质中的Gd^(3+),调控激活剂Bi^(3+)周围局部环境,制备了一系列发光颜色可调的Cs3Gd0.96-yLuyGe_(3)O_(9):0.04Bi^(3+)(0.1≤y≤0.9)固溶体荧光粉。X射线衍射、稳态/瞬态荧光光谱、变温光谱对荧光粉样品的物相结构、发光特性、荧光寿命、热稳定性进行了详细表征。结果表明,我们成功合成了一系列纯相的Cs_(3)Gd_(1-x-y)Lu_(y)Ge_(3)O_(9):xBi^(3+)化合物。在紫外光330 nm激发下,Cs_(3)Gd_(1-x)Ge_(3)O_(9):xBi^(3+)荧光粉的发射峰位于452 nm,呈现蓝光发射,该宽带发射峰源于Bi^(3+)的^(3)P_(1)→^(1)S_(0)跃迁,Bi^(3+)掺杂浓度为0.04 mol时,Cs_(3)Gd_(1-x)Ge_(3)O_(9):xBi^(3+)荧光粉的荧光强度达到最大值。在最优Bi^(3+)掺杂浓度下,通过Lu^(3+)替代基质中的Gd^(3+),发现合成的一系列Cs_(3)Gd_(0.96-y)Lu_(y)Ge_(3)O_(9):0.04Bi^(3+)(0.1≤y≤0.9)固溶体荧光粉发射峰逐渐发生红移,随着Lu^(3+)掺杂浓度的逐渐增加,发射峰从x=0.1 mol时的453 nm逐渐红移至x=0.9 mol时的483 nm,相应的半峰宽从88 nm展宽至116 nm,色坐标从蓝色区域(0.1685,0.1602)过渡到青色区域(0.2179,0.3007)。样品光谱行为的变化主要是因为晶体场劈裂程度增大和斯托斯克位移增大。探究了x=0.04 mol、y=0.5 mol样品的发光热稳定性,当温度升高到423 K时样品的发光强度保持在初始值的55%。所得到的一系列发光颜色可调的固溶体荧光粉在全光谱照明、植物照明等领域具有潜在的应用。Phosphor-converted White Light-Emitting Diodes(pc-WLEDs)have energy-saving,environmental protection and other excellent performance.At present,the commercial WLEDs are composed of blue LED chip combined with Y3Al5O12:Ce^(3+)yellow phosphor.However,due to the lack of red components in the emission spectrum,the white light generated by this method has a low color rendering index(CRI<75)and a high correlation color temperature(CCT>4500 K),which cannot satisfy the needs of indoor lighting.Researchers at home and abroad have proposed an improved method to generate white light by excitation of red,green and blue phosphors by a near-ultraviolet LED chip.Although this method can produce warm white light for indoor illumination,there is a significant cyan gap in the cyan region of the visible spectrum(480~520 nm),which makes it challenging to achieve full spectral illumination.Therefore,it is desirable to obtain a cyan luminescent material that can achieve full spectrum illumination by mixing phosphors.It is well known that rare-earths Eu^(2+)and Ce^(3+)have been widely used as activator ions in inorganic phosphors.However,Eu^(2+)/Ce^(3+)activated phosphors have spectral overlap in the visible region,resulting in low luminescence efficiency and color drift of the synthesized devices.Compared with rare earth ions,Bi^(3+)hardly absorbs in the visible region,so Bi^(3+)activated phosphors can effectively avoid the spectral reabsorption problem encountered by rare earth Eu^(2+)/Ce^(3+).At the same time,the outermost electrons 6s and 6p of Bi^(3+)are exposed and sensitive to the changes of crystal field environment,so Bi^(3+)is considered as an activator ion that can realize the color-tunable of phosphors luminescence.Therefore,the abundant optical properties of bismuth ions have attracted extensive attention.In this paper,a series of Cs_(3)Gd_(1-x)Ge_(3)O_(9):xBi^(3+)(0.02≤x≤0.1)blue phosphors were synthesized by the traditional high-temperature solid-state method.The local environment around Bi^(3+)is regulated by replaci

关 键 词：颜色可调 固溶体 Bi^(3+)掺杂 宽带发射 全光谱 

分 类 号：O482.31[理学—固体物理]