| Summary: | 碩士 === 國立臺灣大學 === 化學研究所 === 106 === This thesis is composed of two major parts. First part, we introduced fluorene core to synthesize three new high photoluminescence (PL) quantum yield red/NIR fluorescent molecules. Second part, we designed a new water-soluble two-photon absorption (TPA) chromophore.
Over the last few decades, TADF-type organic light-emitting diodes (OLED) is rapidly expanding, and the internal quantum efficiency (IQE) has already reached to 100%. However, it is difficult to design a red/NIR TADF molecule with high PL quantum yield and good light color purity. In this research, we designed three new high PL quantum yield red/NIR fluorescent molecules NZDFT, NZDSF and BBTDSF, and used as dopants dispensed in the TADF exciplex host. The red/NIR emitting devices were obtained external quantum efficiencies (EQE) of 6.89%、12.44% and 0.99%, respectively.
Two-photon absorption (TPA) process is a nonlinear absorption process, which absorbs two photons simultaneously. TPA chromophores have wide applications such as fluorescence microscopy and microfabrication. Therefore, in order to increase molecular TPA cross section and tune the position of the TPA peak wavelength, it is a urgent issue to unveil the structure-property relationship with new TPA molecules. In this research, we designed a new water-soluble TPA molecule BTDFNCOOH (σ = 188 GM at 780 nm) with emission peaked at 597 nm in the water (PLQY<5%).
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