Synthesis Of Single Full Phosphorescent Molecular White-emitting Materials And Blue, Hole-transport, Host Materials With1,3,5-Trisubstituted Benzene As Framework

Organic light-emitting diodes (OLEDs) have attracted high research enthusiasmfrom both scientific and industrial communities for their promising applications inflat-panel displays and solid-state illumination sources. Besides the improvement ofthe production process and structure of OLEDs, designing and synthesizing organicelectroluminescent materials with excellent performance is of great importance fortheir commercialization. In this paper, We synthesized a single full phosphorescentwhite molecule, eight novel blue/host/hole-transport materials (K1-K8) with1,3,5-trisubstituted Benzene as matrix modified by triphenylamines, carbazoles,anthracenes and tetraphenylsilanes. In addition, We have investigated the thermalproperties and OLED performance of BP1-10. Details are as follows:1) A single full phosphorescent white molecule was designed by introducingR-G-B three primary colours group into carbazole core and synthesized by Ullmannreaction, NBS bromination, Suzuki coupling reaction. Characterized by1H NMR, MSand elementary analysis. In addition, We have investigated the optoelectronicproperties of intermediates13,14. These date indicate that13,14suitable asblue-green dopants for the application in White OLED.2) A series of novel blue/host/hole-transport materials(K1-K8) with1,3,5-trisubstituted Benzene as matrix were synthesized by the reaction of Suzukicoupling reaction, boric-acidification, ect from initial1,3,5-tribromobenzene andcharacterized by EA,1H-NMR and MS. Properties including UV-Vis spectra,fluorescence emitting spectra, quantum yields, cyclic voltammetry, thermal propertieswere thoroughly investigated. These results imply that the K1-K8could be a greatcandidate as blue/host/hole-transport materials for the application in OLED.3) The thermal properties and OLED performance of ten asymmetric biphenylderivatives (BP1-10) were thoroughly investigated. They all show good thermallystable and excellent device performance. These date clearly indicate that BP1-10suitable for blue emitting, host and hole transport materials and it is versatile.