不同厚度鋅螫合物於介電質及金屬層上之光激螢光之研究

Abstract

The discovery of luminescence from organic materials has stimulated a lot of research activities due to their potential applications as organic light emitting devices and organic semiconductor lasers. Recently, significant enhancement of spontaneous emission aided by surface plasmonic energy transfer has been demonstrated for organic materials and inspired the development of nanoscale laser. As a part of series of work on photoluminescence (PL) from organic materials in our laboratory, in this work we investigated the influence of surface plasmonic coupling on PL from (8-hydroxyquinoline)-zinc (Znq2) thin films doped with 4-dicanomethylene-2-methy-6-(p-dimethyI-aminostyryl)-4H-pyran (DCM) (Znq2:DCM). In Znq2:DCM the photon energy absorbed by the host material, Znq2, is transferred to the dye dopant, DCM, through Förster energy transfer process. The enhancement of emission from Znq2:DCM was observed when the ultrathin organic films with thickness less than 50 nm are coupled with different metals, gold and silver. For thin Znq2:DCM films with the thickness ≥20 nm, larger enhancement was achieved when it is coupled with Ag than with Au. In the time-resolved photoluminescence (TRPL) measurement, we observed the shortening of emission lifetime for metal-coupled films, indicating fast energy exchange between excited dye molecules and surface plasmons.

The discovery of luminescence from organic materials has stimulated a lot of research activities due to their potential applications as organic light emitting devices and organic semiconductor lasers. Recently, significant enhancement of spontaneous emission aided by surface plasmonic energy transfer has been demonstrated for organic materials and inspired the development of nanoscale laser. As a part of series of work on photoluminescence (PL) from organic materials in our laboratory, in this work we investigated the influence of surface plasmonic coupling on PL from (8-hydroxyquinoline)-zinc (Znq2) thin films doped with 4-dicanomethylene-2-methy-6-(p-dimethyI-aminostyryl)-4H-pyran (DCM) (Znq2:DCM). In Znq2:DCM the photon energy absorbed by the host material, Znq2, is transferred to the dye dopant, DCM, through Förster energy transfer process. The enhancement of emission from Znq2:DCM was observed when the ultrathin organic films with thickness less than 50 nm are coupled with different metals, gold and silver. For thin Znq2:DCM films with the thickness ≥20 nm, larger enhancement was achieved when it is coupled with Ag than with Au. In the time-resolved photoluminescence (TRPL) measurement, we observed the shortening of emission lifetime for metal-coupled films, indicating fast energy exchange between excited dye molecules and surface plasmons.