NaLu(WO_(4))_(2):xEu^(3+)荧光粉中Tb^(3+)高掺杂诱导的能量转移及LED应用

LED application and energy transfer induced by high Tb^(3+) doping of NaLu(WO_(4))_(2):xEu^(3+)phosphors

采用水热法制备了掺杂浓度不同的NaLu_(1-x-y)Tb_(y)(WO_(4))_(2):xEu^(3+)系列荧光粉.利用XRD、SEM、激发光谱、发射光谱、时域光谱等手段研究了荧光粉的晶体结构、颗粒形貌和光谱学属性.结果表明,与未掺杂Tb^(3+)的最优荧光粉相比,NaLu_(0.50_Tb_(0.41)(WO_(4))_(2):0.09Eu^(3+)荧光粉实现了一个量级以上的荧光增强,该增强主要归因于先Eu^(3+)→Tb^(3+)后Tb^(3+)→Eu^(3+)的两步能量转移.利用395 nm紫外芯片和发光最强荧光粉封装的红光LED在植物补光领域具备较好的应用前景.

NaLu_(1-x-y)Tb_(y)(WO_(4))_(2)∶xEu^(3+)series phosphors with different doping concentrations were prepared by hydrothermal method.The crystal structure,morphology and spectroscopic properties of the phosphors were explored by XRD,SEM,excitation spectroscopy,emission spectroscopy and time-domain spectroscopy.The results show that the emission intensity of NaLu_(0.50)Tb_(0.41)(WO_(4))_(2)∶0.09 Eu^(3+)phosphor was ten times stronger than that for the optimal phosphor without Tb^(3+).The remarkable enhancement was mainly attributed to the successive energy transfer of Eu^(3+)→Tb^(3+)and Tb^(3+)→Eu^(3+).The red LED packaged with 395 nm ultraviolet chip and the NaLu_(0.50)Tb_(0.41)(WO_(4))_(2)∶0.09 Eu^(3+)phosphor will present a great potential in plant supplementary lighting field.