Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.
ACS Nano. 2013 Aug 27;7(8):7186-92. doi: 10.1021/nn402598e. Epub 2013 Aug 9.
Arrays of subwavelength holes (nanoholes) in Au films were computationally designed, fabricated, and used as templates to localize and enhance the luminescence of upconversion nanophosphors (UCNPs)--hexagonal phase NaYF4 doped with Yb(3+) and Er(3+). The dimensions of nanohole Au arrays were designed to accept only a single UCNP upon particle filling and with a periodicity to be resonant with the excitation wavelength of the upconversion. Frequency-dependent luminescence enhancements of up to 35-fold and a concomitant shortening of the UCNP luminescence rise time were observed, consistent with simulations of plasmonic enhancement of the UCNP absorption.
金膜中的亚波长纳米孔（纳米孔）阵列经过计算设计、制造，并用作模板，以定位和增强上转换纳米荧光粉（UCNPs）的发光——掺杂 Yb(3+)和 Er(3+)的六方相 NaYF4。纳米孔 Au 阵列的尺寸设计仅在颗粒填充时接受单个 UCNP，并且具有与上转换激发波长共振的周期性。观察到高达 35 倍的频率相关发光增强，以及 UCNP 发光上升时间的相应缩短，这与 UCNP 吸收的等离子体增强模拟一致。
