Constructing diazacarbazole-bicarbazole bipolar hybrids by optimizing the linker group for high efficiency, low roll off electrophosphorescent devices

Lv, Xialei; Wang, Bo; Tan, Jianghong; Huang, Zhi; Zhang, Qing; Xiang, Songpo; Liu, Wei; Zhuang, Shaoqing; Wang, Lei

doi:10.1016/j.dyepig.2016.08.029

Cited by 11 publications

(3 citation statements)

References 49 publications

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“…Subsequently, the same group designed a series of host materials based on 1,5‐diazacarbazole (NCzpPh2Cz, NCzpPy2Cz, and NCzmPy2Cz). [ 65 ] It was found NCzmPy2Cz with meta‐substituted pyridine linker had higher E T and balanced charge transportation. Accordingly, NCzmPy2Cz acquired superior performance of EQE max of 20.0% in blue PhOLEDs.…”

Section: The Categories Application and Performance Of High Tripletmentioning

confidence: 99%

High Triplet Energy Hosts for Blue Organic Light‐Emitting Diodes

Wang

Yun

Wang

et al. 2020

Adv Funct Materials

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Blue organic light‐emitting diodes (OLEDs) have been a bottleneck for OLEDs lighting and flexible displays. Improving the operational lifetimes and simultaneously decreasing efficiency roll‐off while maintaining high quantum efficiency is currently a challenge in the scientific community and industry. Optimizing the fabrication process of devices and developing stable and efficient luminescence and transporting materials and developing host materials with high triplet energy is an effective way to overcome this obstacle. On the one hand, the host material can disperse the blue emitters to reduce the possibility of exciton annihilation. On the other hand, it can adjust the carrier transport, exciton formation, and energy transfer in the device. In recent years, many efforts have been undertaken for the design, synthesis, and applications of the novel host. A systematic summary and comments on the recent advances of high triplet energy hosts for blue OLEDs are provided here, which specifically include bipolar transport hosts, single thermally activated delayed fluorescence (TADF) hosts, TADF assistant hosts, exciplex hosts, exciplex free type mixed hosts, and electroplex hosts. Moreover, future prospects for host for high performance blue OLEDs are also proposed.

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Section: The Categories Application and Performance Of High Tripletmentioning

confidence: 99%

High Triplet Energy Hosts for Blue Organic Light‐Emitting Diodes

Wang

Yun

Wang

et al. 2020

Adv Funct Materials

Self Cite

146

112

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show abstract

“…30 Compared with the para-linkage, the meta-linkage leads to a lower degree of p-conjugation since the metapositions are known to reveal the lower electron densities. 43,46,47 Moreover, the meta-linkage could lead to a more twisted molecular configuration and increased steric hindrance which are conducive to inhibiting the formation of excimers. 48,49 Many host materials have been designed using meta-linking mode for high-performance blue and white OLEDs.…”

Section: Introductionmentioning

confidence: 99%

“…48,49 Many host materials have been designed using meta-linking mode for high-performance blue and white OLEDs. 24,[43][44][45][46][47] In this work, we designed two star-shaped host materials, namely tris(3-(diphenylphosphanyl oxide)phenyl)phosphane oxide (m4PO) and tris(3-(carbazole)phenyl)phosphane oxide (m3CzPO), based on a triphenylphosphine oxide (TPPO) scaffold, and three meta-substituted phenylphosphine oxide or carbazole fragments (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%