TY - JOUR
T1 - Multiple σ–π Conjugated Molecules with Selectively Enhanced Electrical Performance for Efficient Solution-Processed Blue Electrophosphorescence
AU - Li, Huanhuan
AU - Li, Hui
AU - Zhi, Yibin
AU - Wang, Jun
AU - Tang, Lele
AU - Tao, Ye
AU - Xie, Guohua
AU - Zheng, Chao
AU - Huang, Wei
AU - Chen, Runfeng
N1 - Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Selectively and controllably regulating molecular functions of organic optoelectronic materials with high solubility for solution-processible devices is highly desired but remains as one of the most significant challenges in material science. Here, a concise molecular design strategy is reported to achieve effective electronic communications using efficient d-orbital participated σ–π conjugations between Si and π unit for purposely modulating the electrical properties of organic optoelectronic materials. Through a two-step reaction in high yield, DSiDCzSi with the enhanced σ–π conjugation is facilely constructed by introducing multiple triphenylsilanes into carbazole unit. Impressively, DSiDCzSi demonstrates a largely increased d-orbital participated extent of Si, which results in the selectively improved frontier orbital energy level, enhanced carrier injection and transportation ability, excellent solubility, and film-forming property. Using DSiDCzSi as a host matrix, solution-processed blue electrophosphorescence device exhibits a maximum external quantum efficiency up to 23.5%, which is among the best values of FIr6-based blue phosphorescent organic light-emitting diodes reported to date. This work, which reveals the vital role of d-orbital participated σ–π conjugations in solving the inherent interference between optical and electrical properties of π-conjugated materials, can provide an extensible and universal avenue for designing and constructing high-performance organic optoelectronic materials for advanced device applications.
AB - Selectively and controllably regulating molecular functions of organic optoelectronic materials with high solubility for solution-processible devices is highly desired but remains as one of the most significant challenges in material science. Here, a concise molecular design strategy is reported to achieve effective electronic communications using efficient d-orbital participated σ–π conjugations between Si and π unit for purposely modulating the electrical properties of organic optoelectronic materials. Through a two-step reaction in high yield, DSiDCzSi with the enhanced σ–π conjugation is facilely constructed by introducing multiple triphenylsilanes into carbazole unit. Impressively, DSiDCzSi demonstrates a largely increased d-orbital participated extent of Si, which results in the selectively improved frontier orbital energy level, enhanced carrier injection and transportation ability, excellent solubility, and film-forming property. Using DSiDCzSi as a host matrix, solution-processed blue electrophosphorescence device exhibits a maximum external quantum efficiency up to 23.5%, which is among the best values of FIr6-based blue phosphorescent organic light-emitting diodes reported to date. This work, which reveals the vital role of d-orbital participated σ–π conjugations in solving the inherent interference between optical and electrical properties of π-conjugated materials, can provide an extensible and universal avenue for designing and constructing high-performance organic optoelectronic materials for advanced device applications.
KW - blue PhOLEDs
KW - d-orbital participation
KW - host materials
KW - solution-processed
KW - σ–π conjugation
UR - http://www.scopus.com/inward/record.url?scp=85073999148&partnerID=8YFLogxK
U2 - 10.1002/adom.201901124
DO - 10.1002/adom.201901124
M3 - 文章
AN - SCOPUS:85073999148
SN - 2195-1071
VL - 7
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 24
M1 - 1901124
ER -