[7a-PB2-1~24] 12.3 Functional Materials and Novel Devices

△ [7a-PB2-8] Emission enhancement and its mechanism of Alq₃ by Ag nanotriangle array

〇(M2)Kazuki Yanome¹, Kazuaki Masui¹, Takayuki Kiba¹, Midori Kawamura¹, Yoshio Abe¹, Kyung Ho Kim¹, Mai Takase², Junichi Takayama³, Akihiro Murayama³ (1.Kitami Inst. of Tech., 2.Muroran Inst. of Tech., 3.IST, Hokkaido Univ.)

Keywords:Localized Surface Plasmon, PL enhancement, Time-resolved spectroscopy

We report on the photoluminescence (PL) in Alq₃ thin film with Ag nanotriangles (NTs) array fabricated by Nanosphere lithography method. Regularly arranged Ag nanotriangles (NTs) array was fabricated on the quartz substrate, using a nanosphere lithography (NSL) method. The 50 nm-thick Ag thin film was deposited by the thermal evaporation on the substrate with PSt beads array, and PSt layer was removed from the substrate by sonication. Subsequently, 60 nm-thick Alq₃ thin film was evaporated on the Ag NTs/substrate. From the steady-state PL measurement, 2-fold PL enhancement was observed for Ag NTs/Alq₃ thin film compared with bare Alq₃ thin film at room temperature. According to the Time-resolved PL measurement, the PL lifetimes of Alq₃ with and without Ag NTs were 6 ns and 21 ns, respectively. These behaviors were explained by the efficient coupling of LSP resonance of Ag nanotriangles array with the emission from Alq₃.