科研之友
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摘要
Nitrogen‐containing polycyclic heteroaromatics have exhibited fascinating multi‐resonance (MR) characteristics for efficient narrowband emission, but strategies to bathochromic shift their emissions while maintaining the narrow bandwidths remain exclusive. Here, homogeneous hexatomic rings are introduced into nitrogen‐embedded MR skeletons to prolong the π‐conjugation length for low‐energy electronic transitions while retaining the non‐bonding character of the remaining parts. The proof‐of‐the‐concept emitters exhibit near unity photoluminescence quantum yields with peaks at 598?nm and 620?nm and small full‐width‐at‐half‐maximums of 28?nm and 31?nm, respectively. Optimal organic light‐emitting diodes exhibit a high external quantum efficiency of 18.2?%, negligible efficiency roll‐off, and ultra‐long lifetime with negligible degradation at an initial luminance of 10?000?cd?m?2 after 94?hours.(#br)Red multi‐resonance emitters with high photoluminescence quantum yields and narrowband emission were dem...
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单位中国科学院; 清华大学
