Improved transient electroluminescence technique based on time-correlated single-photon counting technology to evaluate organic mobility.
Improved transient electroluminescence technique based on time-correlated single-photon counting technology to evaluate organic mobility.
复制标题
基于时间相关单光子计数技术的改进瞬态电致发光技术评价有机迁移率。
DOI：
10.1007/s12200-022-00021-8
复制
发表时间：
2022-04-20
影响因子：
5.4
通讯作者：
Ma, Dongge
中科院分区：
文献类型：
--
作者：
Qiao, Xianfeng;Xiao, Shu;Yuan, Peisen;Yang, Dezhi;Ma, Dongge
暂态电致发光(EL)技术被广泛应用于有机电致发光器件中载流子迁移率的测量。由于背景噪声导致对迁移率的低估，使用示波器的传统模拟检测策略通常是有限的。在本文中，我们利用时间相关单光子计数(TCSPC)来探测用于迁移率计算的瞬时电致发光。对三(8-羟基喹啉)铝(Alq3)的测量表明，在所有研究的电压下，用TCSPC技术得到的电子迁移率都略高于用模拟方法得到的电子迁移率。此外，与示波器的迁移率相比，TCSPC的迁移率对电场根部的依赖程度更小。这些改进归功于TCSPC独特的原理，它通过计数单光子脉冲的数量来量化EL强度，提高了它的单光子灵敏度，并消除了电噪声的负面影响。这些优点使TCSPC成为表征时间分辨电致发光的一种强有力的技术。网上版载有补充材料，可在10.1007/s12200-022-00021-8查阅。
The transient electroluminescence (EL) technique is widely used to evaluate the carrier mobility in the field of organic light emitting diodes. The traditional analog detection strategy using oscilloscopes is generally limited since the background noise causes an underestimation of the mobility value. In this paper, we utilize time-correlated single-photon counting (TCSPC) to probe the transient EL for mobility calculation. The measurements on tris(8-hydroxyquinoline) aluminum (Alq3) show that the electron mobilities obtained using the TCSPC technique are slightly higher than those obtained from the analog method at all the investigated voltages. Moreover, the TCSPC mobilities demonstrate weaker dependence on the root of electrical field compared to the oscilloscope mobilities. These improvements are attributed to the unique principle of TCSPC, which quantifies the EL intensity by counting the number of single-photon pulses, improving its single-photon sensitivity and eliminating the negative impacts of electrical noise. These advantages make TCSPC a powerful technique in the characterization of time-resolved electroluminescence. The online version contains supplementary material available at 10.1007/s12200-022-00021-8.