期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 49, 页码 42935-42942出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b16586
关键词
plasmon; upconversion luminescence; selective enhancement; lanthanide-doped nanoparticle; temperature sensing
资金
- National Natural Science Foundation of China [11274395]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13042]
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications (Jinan University) [CZ156091]
By introducing an 18 nm thick Au nanofilm, selective enhancement of green emission from lanthanide-doped (beta-NaYF4:Yb3+/Er3+) upconversion nanoparticles (UCNPs) is demonstrated. The Au nanofilm is deposited on a microfiber surface by the sputtering method and then covered with the UCNPs. The plasma on the surface of the Au nanofilm can be excited by launching a 980 nm wavelength laser beam into the microfiber, resulting in an enhancement of the local electric field and a strong thermal effect. A 36-fold luminescence intensity enhancement of the UCNPs at 523 nm is observed, with no obvious reduction in the photostability of the UCNPs. Further, the intensity ratios of the emissions at 523-545 nm and at 523-655 nm are enhanced with increasing pump power, which is attributed to the increasing plasmon-induced thermal effect. Therefore, the fabricated device is further demonstrated to exhibit an excellent ability in temperature sensing. By controlling the pump power and the UCNP concentration, a wide temperature range (325-811 K) and a high temperature resolution (0.035-0.046 K) are achieved in the fabricated device.
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