Kim Seonghoon, Sun Fangfang, Chen Hongxia, Koh Kwangnak, Kyhm Kwangseuk, Lee Jaebeom
Department of Nanomedical Engineering, Pusan National University, Miryang 627-706, Korea.
J Nanosci Nanotechnol. 2009 Dec;9(12):7061-4. doi: 10.1166/jnn.2009.1595.
Semiconductor nanomaterials have attracted considerable attention in the design of high efficiency PL up-conversion in heterojunctions or nanostructures at extremely low continuous wave (cw)-excitation intensity. In this study, bioconjugated hybrids were constructed using CdTe and Au nanoparticles (NPs), where two-fold PL enhancement was observed in the solution state. These results are in accordance with theoretical predictions of the local-field effects associated with the combined influence of strong localization of the collective plasmon modes in metallic-semiconducting hybrids and multi-photon absorption into its localized plasmon modes. The feasibility of the nanohybrids as sensors was demonstrated by breaking the bioconjugation through thermal stress, which induced a rapid decrease in luminescence intensity. It is believed that the phenomena is applicable to high-compacted optoelectronic devices and sensing systems that take advantage of both quantum confinement effects and nonlinear optical properties.
半导体纳米材料在极低连续波（cw）激发强度下异质结或纳米结构中高效光致发光上转换的设计方面引起了相当大的关注。在本研究中，使用碲化镉和金纳米颗粒（NPs）构建了生物共轭杂化物，在溶液状态下观察到了两倍的光致发光增强。这些结果与理论预测相符，该理论预测了与金属 - 半导体杂化物中集体等离子体模式的强定位以及其局部等离子体模式中的多光子吸收的综合影响相关的局部场效应。通过热应力破坏生物共轭，证明了纳米杂化物作为传感器的可行性，这导致发光强度迅速降低。据信，该现象适用于利用量子限制效应和非线性光学特性的高紧凑光电器件和传感系统。
