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Very low amplified spontaneous emission threshold from a molecular host-guest energy-transfer system and electroluminescence from light-emitting diode structure

机译:分子主体-客体能量转移系统的极高放大自发发射阈值和发光二极管结构的电致发光

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We report on the characteristics of a host-guest lasing system obtained by co-evaporation of an oligo(9,9-diarylfluorene) derivative named T3 with the red-emitter 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran dye (DCM). We demonstrate that the ambipolar semiconductor T3 can be implemented as active matrix in the realization of a host-guest system in which an efficient energy transfer takes place from T3 matrix to the lasing DCM molecules. We performed a spectroscopic study on the system by systematically varying the DCM concentration in the T3 matrix. Measurements of steady-state photoluminescence (PL), PL quantum yield (PLQY) and amplified spontaneous emission (ASE) threshold are used to optimize the acceptor concentration at which the ASE from DCM molecules takes place with the lowest threshold.rnOrganic light-emitting diodes (OLEDs) implementing the DCM:T3 host-guest system as recombination layer are fabricated for verifying the optical properties of the optimised blend in real working devices.rnIndeed, the very low ASE threshold of T3:DCM makes the investigated blend an appealing system for use as active layer in lasing devices. In particular, the ambipolar charge transport properties of the T3 matrix and its field-effect characteristics make the host-guest system presented here an ideal candidate for the realization of electrically-pumped organic lasers.
机译:我们报告了通过共蒸发名为T3的低聚(9,9-二芳基芴)衍生物与红色发射体4-(二氰基亚甲基)-2-甲基-6-(p- (二甲基氨基苯乙烯基)-4H-吡喃染料(DCM)。我们证明双极性半导体T3可以实现为主客体系统中的有源矩阵,在该系统中,有效的能量从T3矩阵转移到激光DCM分子。我们通过系统地改变T3基质中的DCM浓度对系统进行了光谱研究。通过测量稳态光致发光(PL),PL量子产率(PLQY)和放大的自发发射(ASE)阈值来优化受体浓度,在该浓度下以最低阈值发生DCM分子的ASE.rn有机发光二极管制造将DCM:T3主宾系统用作重组层的(OLED)来验证实际工作设备中优化混合物的光学性能。事实上,T3:DCM的非常低的ASE阈值使所研究的混合物成为吸引人的系统在激光设备中用作有源层。尤其是,T3矩阵的双极性电荷传输特性及其场效应特性使此处介绍的主宾系统成为实现电泵有机激光器的理想候选者。

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