The Research Of Implementation Mechanisms And Technological Approaches For Organic Semiconductor Laser

In the past decade, solid-state organic lasers have received much attention for their use as compact light sources because of the material advantages of organic compounds for producing various luminescent colors and their flexibility in thin-film fabrications. Nowadays, a laser source exhibiting multicolor operation is expected to be realized, which might be a key component in various fields such as spectroscopy, scintillation, and the development of compact display and projection modules. However, the key technology lies in how to realize a μ-total analysis system based on the lab-on-a-chip concept.In order to realize the multi-color laser source and simplify the laser system, this work was based on organic small molecule laser dye and investigated that spontaneous amplified spontaneous emission(ASE) in multilayered planar waveguides and blend system which based on energy transfer, and schemes for diode-pumped organic semiconductor laser. The main contents of the dissertation include the following three aspects:The thesis firstly described a multi-wavelength spontaneous ASE with multilayer stacked active planar waveguides. A modulating layer of silver was applied to make a good confinement of ASE in one active layer, while a lithium fluoride layer was inserted between the active layer and the modulating layer to avoid fluorescence quenching and confine the pump energy in one waveguide. Under optical pumping, ASE at 503 and 662 nm corresponding to the respective active layer were simultaneously observed, with extremely low thresholds at ~37.2 and ~39.7 μJ/cm2.Secondly, the thesis demonstrated spontaneous ASE characteristics of binary blends with green and red laser dyes and ternary blends with three primary color laser dyes. The results showed that the stimulated emission rate of donor can be balanced with the F?rster resonance energy transfer from the donor to the acceptor by adjusting the doping concentration of donor or acceptor dye, leading to the realization of the multi-wavelength ASE. The binary blend emission was at 493 and 570 nm with threshold at 15.7 and 19.1 μJ/cm2 respectively, while the ternary blend emission was at 452, 510 and 596 nm with threshold at 22.0, 18.6 and 23.8 μJ/cm2 respectively.Finally, two potential schemes were proposed in this work to realize an organic solid laser pumped by electroluminescence emission in an integrated organic light emitting diode(OLED) employing low threshold laser dyes, [1,4-bis[2-[4-[N,N-di(ptolyl)amino]phenyl]vinyl] benzene(DSB) and DSB doped with 4(dicyanomethylene)-2-t-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran(DCJTB), as the hole injection layer(HIL). Using DSB as HIL was found to improve the efficiency of the device, which exhibited peak efficiencies of 9.59 cd/A and 6.93 lm/W. For the system employing DSB doped with DCJTB as HIL, the mobility of the electron transport layer made a large contribution to the realization of a diode-pumped organic solid-state laser. Moreover, the optical characteristics of organic films pumped by a pulsed Nd:YAG laser at 355 nm were also investigated.