Improved Performance of Hybrid Organic/Inorganic p–n Heterojunction White Light-Emitting Diodes with 4,4'-Cyclohexane-1,1-diylbis[N,N-bis(4-methylphenyl)aniline] as a Multifunctional Hole Transport Layer

摘要

Electrically driven hybrid organic/inorganic white light-emitting diodes (WLEDs) with low-cost, easy fabrication, and excellent electroluminescence (EL) performance have attracted tremendous attention recently. However, many issues, especially imbalanced carrier injection, have limited their development, so further research is needed. Herein, 4,4 '-cyclohexane-1,1-diylbis[N,N-bis(4-methylphenyl) aniline] (TAPC) with a large bandgap is introduced as a multifunctional hole transport layer (MHTL) for efficient hybrid organic/inorganic WLEDs. Optimized hybrid WLEDs with TAPC are achieved with a peak current efficiency of 20.6 cd A1 and a near purity white light with color coordinates of (0.32, 0.33). They exhibit better EL performance than those without TAPC. This proves that an optimized TAPC layer can effectively reduce electron overflow and improve hole injection to acquire much better charge balance in the emitting layers. Such good results will significantly promote the design and fabrication of phosphor-free WLEDs with high performance.