Anthracene and carbazole based asymmetric fluorescent materials for high-efficiency deep-blue non-doped organic light emitting devices with CIEy=0.06

Deep-Blue emitting materials have important applications in field of optoelectronics. However, their development with high color purity faces great challenges due to inherent wide energy gap. Herein, three anthracene-based fluorescent materials (pCzAnN, mCzAnN and 3CzAnN) were designed and synthesized by adjusting the linking position of anthracene to carbazole. These three twisted anthracene derivatives exhibited deep blue emission in toluene solution and thin film. Their electroluminescent performances was investigated by fabricating non-doped organic light-emitting diodes (OLEDs), exhibiting deep-blue emission with peaks at 444, 440 and 448 nm. The device performance based on pCzAnN as the emitter achieved a low turn-on voltage of 3.3 V, external quantum efficiency of 6.0%, deep-blue emission at 444 nm with good color purity CIE coordinates (0.15, 0.07) and a narrow full width at half maximum of 50 nm.