采用高温固相法合成了Er3+、Yb3+共掺杂的NaYF4荧光粉。XRD测量数据表明合成的样品为纯相。测量了样品的激发谱和发射谱, 证明377 nm的紫外光通过量子剪裁的形式将能量传递给一个Yb3+, 发射一个975 nm的红外光子, 再从4F9/2能级跃迁到基态发射一个红外光子。测量了377 nm激发下, 监测541 nm的发光寿命曲线, 计算得到最大的量子效率为126.35%。通过监测Yb3+的975 nm的近红外发射, 证明了Er3+的4F7/2和2H11/2能级通过下转换的形式将吸收的485 nm和519 nm的能量传递给Yb3+。这种将Er3+在可见光波段的多种光子能量传递给Yb3+发射975 nm的近红外光子的思想在以前的研究中从未被提出。

Er3+, Yb3+ doped NaYF4 phosphors were prepared by high-temperature solid state method. Structures of the samples were investigated by X-ray diffraction. The excitation and emission spectra of the phosphors were measured. The 377 nm photon jumped from 4G11/2 to 4F9/2, and the energy was transferred to 2F5/2 energy level of Yb3+. A 975 nm near-infrared photon was thus obtained. Then, the photon in 4F9/2 jumped to the ground state and emitted a 670 nm red photon. Furthermore, the luminescence decay curves of 541 nm emission excited by 377 nm were measured, and the quantum efficiencies were calculated. The maximum quantum efficiency was 126.35%. By monitoring the 975 nm emission, the energy transfer from 4F7/2(485 nm) and 2H11/2(519 nm) of Er3+ to Yb3+ also occurred by down-conversion. This research has not been done before.