Intermolecular interactions arise from molecular aggregation and cause concentration quenching and excimer emission. Although aggregation or excimer induced emission are sometimes favored, for example for colour tuning, intermolecular interactions should usually be minimized because concentration quenching and excimer emission usually result in poor efficiency and colour instability. In this paper, two novel tert-butyl modified naphthyl derivates, 4,5′-di-{[N,N,N′,N′- tetrakis-(4-tert- butyl-phenyl)]phenyl-1″,4‴-diamine}-1,1′-binaphthalenyl (BN5) and 1,5-di-{[N,N,N′, N′-tetrakis-(4-tert-butyl-phenyl)]phenyl-1″,4‴-diamine}-3,7-bi-tertbutylnaphthalenyl (BN6), have been synthesized and their intriguing photophysical properties and high-efficiency deep-blue electroluminescence (EL) in less-concentrated condensed phase investigated. Electroluminescent devices based on BN5 in 50% matrix achieved a high external quantum efficiency (EQE) of 3.7% and the Commission Internationale de L'Eclairage (CIE) coordinates of (0.160, 0.081) which is very close to the National Television Standards Committee's (NTSC of USA) pure blue standard. Meanwhile, the non-doped device based on BN5 demonstrated a much higher EQE of 4.5%. Neat BN6-based device presented a pure monomer emission (λ_peak = 420 nm) with an extremely high EQE of 5.1% and a satisfactory CIE coordinate of (0.171, 0.076). Such values are the best ever reported for 420 nm EL emission with an un-doped layer. We attributed the enhanced performance of deep blue monomer light-emitting diodes to tert-butyl groups of BNs due to a reduction of intermolecular interaction, especially the tert-butyl substituents on the molecular backbone of BN6 play a major role in inhibiting dimer and crystallization-induced emission.

分子间相互作用是由分子聚集引起的，并引起浓度猝灭和准分子发射。尽管有时会喜欢聚集或受激准分子诱导的发射，例如为了进行颜色调整，但通常应使分子间的相互作用最小化，因为浓度猝灭和受激准分子的发射通常会导致效率低下和颜色不稳定。本文研究了两个新型的叔丁基改性萘基衍生物，4,5'-二-{[[N，N，N'，N'-四-（4-叔丁基-苯基）]苯基-1''，4 ‴-二胺} -1,1'-联萘基（BN5）和1,5-二-{[N，N，N'，N'-四-（4-叔丁基-苯基）]苯基-1''，合成了4‴-二胺} -3,7-二叔丁基萘（BN6），并研究了其在低浓度的凝聚相中的引人入胜的光物理性质和高效的深蓝色电致发光（EL）。在50％矩阵中基于BN5的电致发光器件实现了3.7％的高外部量子效率（EQE），国际照明委员会（CIE）的坐标为（0.160，0.081），非常接近国家电视标准委员会（美国NTSC）纯蓝色标准。同时，基于BN5的非掺杂器件的EQE更高，为4.5％。基于BN6的整洁设备呈现出纯单体排放（λ_峰值 = 420 nm），EQE极高，为5.1％，令人满意的CIE坐标为（0.171，0.076）。对于具有未掺杂层的420 nm EL发射，该值是有史以来最好的。由于分子间相互作用的减少，我们将深蓝色单体发光二极管的性能提高归因于BN的叔丁基，特别是BN6分子主链上的叔丁基取代基在抑制二聚体和结晶方面起着主要作用，感应发射。