Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 18, Pages 11667-11674Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b12075
Keywords
upconversion; surface plasmon; nanoparticles; monolayer supercrystal; plasmonically enhanced luminescence
Funding
- Major State Basic Research Development Program of China (973 Program) [2014CB643506]
- National Natural Science Foundation of China [11374127, 11304118, 61204015, 81201738, 81301289, 61179055, 61177042, 51202019, 11504131, 11174111]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT13018]
- Jilin Province Natural Science Foundation of China [20140101171JC]
- Open Research Fund of State Key Laboratory of Bioelectronics, Southeast University, Jilin Provincial Economic Structure Strategic Adjustment Fund Special Projects [2014Y082]
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Upconversion nanophosphor is attracting world, wide interests-owing to its unique optical properties and great application potentials. However, it is still a great challenge to effectively improve the efficiency/strength of upconversion nanophosphor. Plasmonic modulation is a promising way to solve this bottleneck. In this work, we present a simple yet versatile concept on magnifying upconversion luminescence of NaYF4:Yb3+, Er3+ nanocrystals through local field manipulation of Surface plasmon. Gold nanorods were directionally assembled into a vertically aligned monolayer supercrystals over large areas. The FDTD simulation indicates that the electromagnetic field strength vertical bar E vertical bar(2) can be improved about 113 folds at the hot spots of monolayer supercrystals. After optimization, on the surface of the vertically aligned monolayer supercrystals, the overall up-conversion luminescence intensity of NaYF4:Yb3+, Er3+ under 980 nm excitation was improved more than 35 fold.
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