Novel Ir(ppy)₃ Derivatives: Simple Structure Modification Toward Nearly 30% External Quantum Efficiency in Phosphorescent Organic Light‐Emitting Diodes

Stable green phosphorescence organic light-emitting diodes with low efficiency roll-off using a novel bipolar thermally activated delayed fluorescence material as host

“…4–6 Recently, green emission has almost approached the theoretical limitation of external quantum efficiency (EQE) by utilizing various dopants, such as fac -tris(2-phenylpyridinato)iridium( iii ), as the phosphorescent emitter, the commercialization of which has been successfully started. 7–9 However, typical PhOLEDs encounter significant roll-off ( i.e. , current efficiency or EQE drastically drops as the applied voltage or brightness increases) problems, leading to an undesired low efficiency at high luminance, which is unfavorable for their commercial realization for lighting.…”

Retina-Inspired Organic Heterojunction-Based Optoelectronic Synapses for Artificial Visual Systems

“…PQT-12 was responsible for the carrier transport, which exhibited high photoresponse to visible light [ 15 ]. Ir(ppy) 3 that attracted tremendous interest in OLED owing to its high efficiency of electrophosphorescence was used to form the heterojunction structure and served as the electron-trapping layer [ 34 , 35 ]. The surface morphology of Ir(ppy) 3 film and PQT-12 on Ir(ppy) 3 film was investigated through atomic force microscopy (AFM), as shown in Figure 1(c) and Figure S2 .…”

Triphenylsilyl-Promoted Iridium Complex for High-Performance Green-Yellow Phosphorescent Organic Light-Emitting Diodes

“…How to lower the sublimation temperature while maintaining a high decomposition temperature is crucial for promoting sublimation yield. The comprehensive performance of the iridium complex should be improved. Although a number of record phosphorescent emitters are developed in recent years, most of them only report limited kinds of excellent parameters, and comprehensive phosphorescent emitters are rare at present. − For commercial applications, more parameters are needed. From green to yellow, more high-performance green-yellow iridium complexes should be developed. Compared with the green iridium complex, the yellow iridium complex is less, and the green-yellow iridium complex is much less.…”

“…Compared with the green iridium complex, the yellow iridium complex is less, and the green-yellow iridium complex is much less. Meanwhile, only several green-yellow iridium complexes report device efficiency greater than 90 cd/A. − This is adverse for developing high-performance white OLEDs with a simple device structure. The device efficiency of the iridium complex should be further improved. For example, the current efficiencies of most reported green/yellow iridium complexes are 50–90 cd/A. − In practical products, the efficiency will further decrease.…”

“…The comprehensive performance of the iridium complex should be improved. Although a number of record phosphorescent emitters are developed in recent years, most of them only report limited kinds of excellent parameters, and comprehensive phosphorescent emitters are rare at present. − For commercial applications, more parameters are needed.…”