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首页> 外文期刊>Advanced Functional Materials >Electron-Affinity Substituent in 2,6-Dicarbonitrile Diphenyl-1λ~5-Phosphinine Towards High-Quality Organic Lasing and Electroluminescence under High Current Injection
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Electron-Affinity Substituent in 2,6-Dicarbonitrile Diphenyl-1λ~5-Phosphinine Towards High-Quality Organic Lasing and Electroluminescence under High Current Injection

机译：电子 - 亲和在2,6-二羰基腈二苯基-1λ〜5-膦素对高质量注射的高质量有机激光和电致发光的取代基

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摘要

Rationally manipulating the functional substituents plays a crucial role in tuning the luminescence and lasing properties of organic gain media. Herein, a cyanophenyl-moiety, which exhibits relatively weaker electron affinity, is connected to 2,6-dicarbonitrile diphenyl-1 lambda(5)-phosphinine (DCNP) via para-linking. Resultantly, the appreciated locally-excited characteristics ensuring a large oscillator strength and high radiative rate can be reserved in DCNP-4-(4-cyanophenyl) (DCNP-pCN). Interestingly, the weak charge-transfer state from the relative donor (D)/acceptor (A) interplay enables small singlet-triplet splitting (Delta E-ST approximate to 0.45 eV). Thus the triplets generated on DCNP-pCN can be efficiently scavenged by 4,4'-bis[(N-carbazole)styryl]biphenyl (BSBCz), which is used as the host with a lower-lying triplet energy level for DCNP-pCN. Moreover, benefitting from the mediation between the conjugated length extension and weak D/A interplay, the emission spectrum cannot be largely shifted, which can effectively suppress the overlap between the lasing emission of DCNP-pCN and the excited-state absorption of BSBCz, thereby avoiding detrimental singlet-triplet annihilation. Thus, high-quality distributed feedback lasings with approximate to 2.0 mu J cm(-2) thresholds are achieved, and the organic light-emitting diodes exhibit external quantum efficiency exceeding 2.0% without efficiency rolloff under high current injection, indicating the potential for electrical-pumping organic lasings.
机译：合理操纵功能取代基在调整发光和有机增益介质的激光性质方面起着至关重要的作用。这里，通过对连接的电子亲和力表现出相对较弱的电子亲和力的氰基苯基部分通过对准连接到2,6-二羰基腈二苯基-1λ（5） - 次膦氨基（DCNP）。结果，可以在DCNP-4-（4-氰基聚苯）（DCNP-PCN）中保留确保大振荡器强度和高辐射率的局部激发特性。有趣的是，来自相对供体（D）/受体（A）相互作用的弱电荷转移状态使得小单向三重态分裂（Delta E-St近似为0.45eV）。因此，在DCNP-PCN上产生的三胞胎可以通过4,4'-BIS [（N-咔唑）Styryl]联苯（BSBCZ）有效地清除，其用作DCNP-PCN的低位三重态能级的主体。此外，从共轭长度延伸和弱D /相互作用之间的中介之间受益，发射光谱不能很大程度地移位，这可以有效地抑制DCNP-PCN的激光发射与BSBCZ的激发 - 状态吸收之间的重叠。避免有害的单态三联歼灭。因此，实现了具有近似为2.0μJCM（-2）阈值的高质量分布式反馈激活，并且有机发光二极管表现出超过2.0％的外部量子效率，在高电流注入下没有效率升压，表明电气电位-pumping有机激进。

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