A new host material, PCNVTPA, was successfully synthesized for high-performance iridium complex light-emitting devices. Efficient energy transfer was observed from the host PCNVTPA to the guest Ir complex. Single-layer phosphorescent electroluminescent devices of ITO/PEDOT: PSS/PCNVTPA:Ir complexes/Ca:Al exhibited maximum luminance (2899cdm−2) and luminance efficiency (8.84 cd A−1), respectively, which were much higher than those of PVTPA. Such an improvement was probably due to more efficient hole trapping in Ir complexes or better electron injection from the lower energy levels of PCNVTPA.
- Yi-Kai Fang
- Wen-Ya Lee
- Wen-Chang Chen
