Anomalous power dependence of upconversion emissions in Gd2O3: Er3+ nanocrystals under diode laser excitation of 970 nm

作者：Chen G Y^*; Liang H J; Liu H C; Somesfalean G; Zhang Z G

来源：Journal of Applied Physics, 2009, 105(11): 114315.

DOI：10.1063/1.3078814

Visible green and red upconversion (UC) emissions with anomalous power dependence were observed in Gd2O3: Er3+ nanocrystals at room temperature under diode laser excitation of 970 nm. The green and red UC radiations both yield an "s"-shape power dependence, in marked contrast to the quadratic ones of the bulk counterparts. A closed positive looping UC mechanism that differs from conventional PA mechanism is proposed to explain the observed five- or six-photon processes in the "s"-shape power dependence. Power dependence analysis of the 1.55 mu m emissions from the I-4(13/2) state experimentally demonstrates our proposed model.

• 出版日期2009-6-1
• 单位哈尔滨工业大学