Upconversion luminescence in Yb3+/Tb3+-codoped monodisperse NaYF4 nanocrystals

作者：Liang Huijuan; Chen Guanying; Li Long; Liu Yuan; Qin Feng; Zhang Zhiguo^*

来源：Optics Communications, 2009, 282(14): 3028-3031.

DOI：10.1016/j.optcom.2009.04.006

Upconversion (UC) luminescence in monodisperse NaYF4:Yb3+/Tb3+ nanocrystals was observed under diode laser excitation of 970 nm, which were synthesized by a hydrothermal method. UC emissions at 380, 413, 436 nm and at 488, 542. 584, 620 nm arise from transitions D-5(3)((5)G(6)) --> F-7(J)(J = 6, 5, 4) and D-5(4) --> F-7(J)(J = 6, 5. 4, 3) of Tb3+ ions, respectively. UC mechanisms are proposed based on spectral, kinetic, decay time measurements, and pump power dependence analyses. Blue, green and red emissions originate from the same long-lived (milliseconds) upper D-5(4) state, which promises the potential applications of these monodisperse Yb3+/Tb3+-codoped NaYF4 nanocrystals in the field of photonics, lasers and biomedicine.

• 出版日期2009-7-15
• 单位哈尔滨工业大学