合成了基于rid啶酮（受体）和萘胺（供体）的供体-受体-供体（DAD）化合物（1），并对其热活化延迟荧光（TADF）性质进行了详细研究。化合物1是荧光的并且在绿色区域（550nm）发射。基态和最低激发单重态（S 1）状态之间的能隙估计为2.55 eV。的CT单线态和三重态（ΔE之间的能隙ST）被发现是〜0.3eV的。小∆E S1-T1是TADF在分子中发生的重要标准之一，因此已研究了详细的光物理。瞬态寿命测量结果表明，使用N吹扫时，荧光寿命（τ）有所增加如图2所示，与空气饱和溶液中的相比，表明三重态参与了发射。还观察到在550 nm处有100 µs的延迟发射，这对应于1中的延迟荧光。发现TADF的寿命为176 µs。TADF材料利用三重态激子有助于提高器件的内部量子效率，因此TADF材料在有机发光器件（OLED）中的应用受到了关注。制造了基于1的空气饱和气体，发现其强度在25 mA / cm 2下几乎高达17,000 Cd / m 2，与许多已知的TADF发射器相当。
图形摘要
合成了rid啶酮-胺衍生物，并通过其光物理性质建立了TADF。它也用于制造OLED。
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Synthesis of acridone-naphthylamine derivative and its thermally-activated delayed fluorescence studies for application in OLEDs
Abstract
Acridone (acceptor) and naphthylamine (donor) based Donor-Acceptor-Donor (D-A-D) compound (1) was synthesised, characterised and its thermally-activated delayed fluorescence (TADF) properties were studied in detail. Compound 1 is fluorescent and emits in the green region (550 nm). The energy gap between the ground and the lowest excited singlet (S1) state is estimated to be 2.55 eV. The energy gap between the CT singlet and triplet states (∆EST) was found to be ~0.3 eV. Small ∆ES1-T1 is one of the important criteria for TADF to take place in a molecule and thus detailed photophysics has been studied. Transient lifetime measurements showed an increase in the fluorescence lifetime (τ) on purging with N2, as compared with that in air-saturated solution, indicating the involvement of the triplet state in emission. Emission at 550 nm was also observed with a delay of 100 µs which corresponded to the delayed fluorescence in 1. The lifetime of TADF was found to be 176 µs. Applications of TADF materials in organic light-emitting devices (OLEDs) has gotten attention as TADF materials utilise the triplet excitons which helps in increasing internal quantum efficiency of device. Air-saturated based on 1 were fabricated and their intensity was found to be nearly as high as 17,000 Cd/m2 at 25 mA/cm2 which was comparable to many of the known TADF emitters.
Graphic abstract
Acridone-amine derivatives was synthesized and its photophysical properties were carried out to establish TADF. It was also used in fabrication of OLEDs.
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