Dong Huanli and Hu Wenping from the Institute of chemistry, Chinese Academy of sciences have made new progress in high efficiency single component organic light-emitting field-effect transistors

Organic light-emitting field-effect transistor (OLED) is a kind of organic light-emitting diode (OLED) Two kinds of functional organic optoelectronic devices, with the advantages of simple preparation process, high integration and current amplification, are considered to be one of the ideal ways for the next generation of transformative flexible display technology and the realization of organic electric pump laser Their research has important scientific and technical significance However, due to the lack of materials for the construction of high-performance OLED devices, the development of OLED devices, especially high-performance single component OLED devices, is seriously lagging behind, which limits the research of related application fields The construction of high-performance OLED devices requires active semiconductor materials with high mobility and strong fluorescence at the same time, but high mobility and strong fluorescence are a pair of contradictions, it is difficult to achieve the effective integration of them in the same material system In view of this, with the support of the leading project of Chinese Academy of Sciences and NSFC, the researchers of the Key Laboratory of all mechanical and solid state institutions of Chinese Academy of sciences have carried out research on high mobility luminescent materials in recent years, and put forward the photoelectric integrated molecular design idea of "anthracene extended pentacene analogues" A series of organic semiconductor material systems with excellent high mobility and luminescent properties (NAT Commun 2015, 6, 10032; J am Chem SOC 2017, 139, 17261; adv mater 2018, 30, 1801048, NAT Commun 2018, 9, 5418) have been developed, laying a good material foundation for further research on optoelectronic functional integrated devices Recently, on the basis of previous research, researchers have used the high mobility luminescent organic semiconductor materials developed by our research group, 2,6-diphenyllanthracene (DPA) and 2,6-di (2-naphthyll) anthracene (dnaant) as active layers to build a single component organic light-emitting field-effect transistor Based on the asymmetric device structure and the control strategy of the interface energy level, the bipolar injection and transmission with high efficiency and balance are realized The results show that the DPA - and dnaant olet devices exhibit stable and strong channel luminescent characteristics Under the gate voltage control, the position of electron and hole compound luminescent can be well regulated in the p-channel and n-channel, which confirms the typical bipolar luminescent characteristics Moreover, the maximum external quantum efficiency (EQE) of DPA - and dnaant olet devices is 1.61% and 1.75% respectively, which is the highest value of single component olet devices reported at present At the same time, DPA - and dnaant olet devices exhibit high luminosity of 1210 CD m-2 and 3180 CD m-2 and high current density of 1.3 Ka cm-2 and 8.4 Ka cm-2, respectively The results show that high mobility luminescent materials play an important role in the realization of high efficiency single-component OLED devices, and the development of high mobility luminescent materials is expected to promote the rapid development of organic light-emitting field-effect transistor devices and related fields Relevant research work was recently published in adv mater (adv mater 2019, 1903175) The first author is Qin Zhengsheng, a doctoral student, and the corresponding author is Dong Huanli, a researcher and Professor Hu Wenping Figure 1 molecular structure formula of DPA and dnaant, schematic diagram of OLED device and EQE efficiency summary diagram of single component OLED (source: Institute of chemistry, Chinese Academy of Sciences)