Optical Properties of Microcavity Structures using the Organic Light Emitting Materials

초록

We investigated the optical properties of Fabry-Perot microcavity with a tris(8-hydroxyquinoline)aluminum (Alq3) organic film by measuring the photoluminescence (PL) and transmittance. An Alq3 layer as an active layer was sandwiched between two mirrors, which were metal or (TiO2|SiO2) dielectric multilayer reflectors. An Alq3 layer on glass, [air|Alq3|glass], showed a PL peak around 513 nm and its full width half maximum (FWHM) was about 80 nm. Three types of microcavity, such as Type A [air|metal|Alq3|metal|glass], Type B [air|dielectric|Alq3|dielectric|glass], and Type C [air|metal|Alq3|dielectric|glass], were fabricated. The result shows that the FWHMs of three Fabry-Perot microcavities were reduced to 15~27.5, 7~10.5 and 16~16.6 nm, respectively, and the microcavity structure is expected to improve the efficiency and tunability of emission spectrum in display.