Optically Pumped Organic Photonic Crystal Microcavity Laser With Red And Green Dual Primary Color Output

Organic semiconductor lasers(OSLs)have broad application prospect in the development of small tunable lasers,flexible lasers,display lighting and integrated optoelectronic devices due to their advantages in tunable spectrum,simple preparation,low cost and convenient integration.The main bottleneck restricting the development of OSLs is the large device loss,leading to higher lasing threshold and thereby limiting the application and development.Photonic crystals(PhCs)are a kind of crystals composed of two or more materials with different dielectric constants arranged periodically on the optical scale.The unique photonic bandgap and localization of PhCs combining the superior luminescence of organic semiconductors lays a physical foundation for optoelectronic devices such as low threshold organic lasers with excellent performance.In this thesis,an optically pumped PhC microcavity laser with green-wavelength emitting is fabricated based on organic doping composite and quasicrystal structure.Further,a red-green dual-wavelength organic PhC microcavity laser is proposed based on super-lattice structure with single-point output.The main work is as follows:Based on the phosphorescence material Ir(ppy)3-doped organic polyvinylcarbazole(PVK)system,we fabricate a green-wavelength organic PhC microcavity laser.The composite material with the optimal doping density 5%effectively improves the light-emitting efficiency.In the horizontal plane,a defect microcavity introduced into 8-fold quasiciystal not only localizes photons,but also absorbs and captures adjacent photons of the same mode.A sandwich structure of DBR-reflector/gain medium/silver-layer is adopted to realize optical oscillation and amplification in vertical.Finally,a green laser is achieved with a threshold of 87.6 ?J/cm2 and a FWHM of 0.8 nm@521.3 nm.In order to realize the red-green dual-wavelength laser output,we have analyze the absorption and luminescence properties of two phosphorescence materials FIrPic and Ir(piq)2(acac)doped PVK system and the bandgap of super-lattice PhC.The results show when the mass ratio of PVK:FIrPic:Ir(piq)2(acac)is 100:10:1,the absorption spectrum and luminescence spectrum have obvious Stokes shift,and the luminescence spectrum extends to 450-700nm with two peaks at 500 nm and 616 nm,respectively.Based on the doped material,we design the super-lattice PhC formed by alternating triangular lattice and square lattice alternately.By optimizing the defects,two resonant peaks at 501nm and 600 nm are achieved based on organic composite.These works not only provide theoretical support for the next-stage fabrication of dual-color organic PhC lasers,but also lay the physical foundation for the potential application in tricolor colorful high-definition display.