Presentation Information
[24p-11F-9]Enhancing Upconversion Luminescence Intensity using Metallic and Dielectric Nanoparticle Arrays
Yuan Gao1,2, 〇Shunsuke Murai2, Katsuhisa Tanaka2 (1.Kunming Univ., 2.Kyoto Univ.)
Keywords:
silicon,Upconversion
Upconversion Nanoparticles (UCNPs) doped with lanthanide ions as emission centers exhibit upconversion luminescence (UCL), but the problem is that the external quantum yield of UCL is low due to the small absorption cross section of lanthanide ions. To overcome this problem, we have been conducting research to increase the optical absorption of UCNPs and enhance the UCL intensity by combining them with a periodic array structure that resonates with the optical absorption wavelength. In this presentation, we present (i) in combination with an aluminum nanoparticle array, we observed a five-photon process UCL in which near-infrared light with a wavelength of 1550 nm is converted to ultraviolet light with a wavelength of 382 nm from core-shell UCNPs; The intensity was more than 800 times that of the UCL intensity on flat glass, and (ii) by combining an amorphous silicon nanodisk array with UCNPs, the two-photon process UCL can be enhanced. By crystallizing silicon through rapid thermal annealing (RTA), the UCL strength was enhanced from 86 to more than 600 times.