期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 17, 页码 19840-19854出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c02602
关键词
upconversion laser; random lasing; electromagnetic hotspots; stretchable lasers; solution-processed; continuous-wave laser
资金
- Advanced Research Centre for Green Materials Science and Technology from The Featured Area Research Centre Program by the Ministry of Education [108L9006]
- Ministry of Science and Technology in Taiwan [MOST 108-3017-F-002-002, MOST 108-2112-M-002-019]
Multifunctional lanthanide-doped upconversion nanoparticles (UCNPs) have spread their wings in the fields of flexible optoelectronics and biomedical applications. One of the ongoing challenges lies in achieving UCNP-based nanocomposites, which enable a continuous-wave (CW) laser action at ultralow thresholds. Here, gold sandwich UCNP nanocomposites [gold (Au-1)-UCNP-gold (Au-2)] capable of exhibiting lasing at ultralow thresholds under CW excitation are demonstrated. The metastable energy-level characteristics of lanthanides are advantageous for creating population inversion. In particular, localized surface plasmon resonance-based electromagnetic hotspots in the nanocomposites and the huge enhancement of scattering coefficient for the formation of coherent closed loops due to multiple scattering facilitate the process of stimulated emissions as confirmed by theoretical simulations. The nanocomposites are subjected to stretchable systems for enhancing the lasing action (threshold 0.06 kW cm(-2)) via a light-trapping effect. The applications in bioimaging of HeLa cells and antibacterial activity (photothermal therapy) are demonstrated using the newly designed A(1)-UCNP-Au-2 nanocomposites.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据