||In this research, a series of novel poly-aromatic ether polymer are synthized and applied in blue organic light-emitting diodes . We use organic light-emitting diodes in host and guest doping system, the choice of the host material is Carbazole of difluoro and glycol derivatives and guest material is Anthracene difluoro derivatives. Generally, because Carbazole derivatives is a very good phosphorescent materials and a very large triplet excitation energy, manny paper use the materias as a host material, and Anthracene derivative is a common blue material, due to the Carbazole materials of PL spectra and the Anthracene of absorption spectra are a great overlap, the host materials use Förster energy transfer transfer the energy to the guest materials, so it has good luminous efficiency. From the perspective of molecular design, this study using the C-F bond and Carbazole increased steric hindrance of the polymer chain and changed by fluorinated compounds of the highest occupied molecular orbital - lowest unoccupied molecular orbital (HOMO-LUMO) energy level position .|
We use different ratio of the Anthracene derivatives and two Carbazole derivatives to synthesize a serias novel blue polymers. Wherein the doping ratio of 25% in the polymer P1 best nature the pyrolysis temperature (Td) of 477 ℃, the glass transition temperature (Tg) of 255 ℃, and in the past, the experiment was 50% of the polymer doping ratio BH achieve very superior efficiency, brightness and CIE coordinates. When the polymer P1 of the solid film thickness and the polymer BH of the solid film thickness are close, the relative intensity PL spectra of polymer P1 is higher 3 to 4 times than the polymer BH and the PL spectra of polymer P1 is at 447nm, these results indicate that this a polymer in a doping ratio of 25% will have the best efficiency.