Department of Bioengineering, School of Engineering, University of Tokyo, Tokyo 113-8656, Japan.
Opt Lett. 2011 Oct 1;36(19):3735-7. doi: 10.1364/OL.36.003735.
We studied photoluminescence (PL) and energy-transfer dynamics in a hybrid structure comprising a Cd(0.08)Zn(0.92)O quantum well (QW) and an Ag nanostructure. The observed PL quenching was dependent on the electronic states in the QW. Quenching occurred at low temperature where excited carriers recombined radiatively because of excitonic localization, which disappeared with increasing temperature due to delocalization of excitons. Furthermore, nanostructured Ag surfaces produced local surface plasmon (LSP) absorption that was resonant with the PL peak energy of the QW emission. These results indicate that the recombination energy of excitons transfers nonradiatively to induce LSP excitation, which was revealed using time-resolved PL measurements.
我们研究了由 Cd(0.08)Zn(0.92)O 量子阱 (QW) 和 Ag 纳米结构组成的混合结构中的光致发光 (PL) 和能量转移动力学。观察到的 PL 猝灭取决于 QW 中的电子态。猝灭发生在低温下，因为激子局域化，激发载流子辐射复合，随着温度的升高，由于激子的离域化，猝灭消失。此外，纳米结构的 Ag 表面产生了与 QW 发射的 PL 峰能量共振的局域表面等离激元 (LSP) 吸收。这些结果表明，激子的复合能非辐射转移诱导 LSP 激发，这是通过时间分辨 PL 测量揭示的。
