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Two-Dimensional Ca2Nb3O10 Perovskite Nanosheets for Electron Injection Layers in Organic Light-Emitting Devices
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-07-26 00:00:00 , DOI: 10.1021/acsami.8b05759
Satoru Ohisa , Tatsuya Hikichi , Yong-Jin Pu , Takayuki Chiba , Junji Kido

We report in this article the application of calcium niobate (CNO) perovskite nanosheets for electron injection layers (EILs) in organic light-emitting devices (OLEDs). Four kinds of tetraalkylammonium hydroxides having different alkyl lengths were utilized as the exfoliation agents of a layered compound precursor HCa2Nb3O10 to synthesize CNO nanosheets, including tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide (TPAOH), and tetrabutylammonium hydroxide. CNO nanosheet EILs were applied in fluorescent poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)] (F8BT) organic light-emitting polymer-based devices. The effects of dispersion concentrations and alkyl chain length on the devices’ performances were investigated. The results demonstrated that OLEDs’ performances were related to the coverage ratio of the CNO nanosheets, their thicknesses, and their work function values. Among the four exfoliation agents, the device with CNO nanosheets exfoliated by TPAOH showed the lowest driving voltage. The OLEDs with the CNO nanosheet EILs showed lower driving voltages compared with the devices with conventional EIL material lithium 8-quinolate.

中文翻译:

用于有机发光器件中电子注入层的二维Ca 2 Nb 3 O 10钙钛矿纳米片

我们在本文中报道了铌酸钙(CNO)钙钛矿纳米片在有机发光器件(OLED)中用于电子注入层(EIL)的应用。使用四种具有不同烷基长度的氢氧化四烷基铵作为层状化合物前体HCa 2 Nb 3 O 10的剥离剂来合成CNO纳米片,包括氢氧化四甲基铵,氢氧化四乙基铵,氢氧化四丙基铵(TPAOH)和氢氧化四丁基铵。CNO纳米片EILS在荧光聚施加[(9,9-二- ñ -octylfluorenyl芴-2,7-二基) -中高音-(苯并[2,1,3]噻二唑-4,8-​​二基)](F8BT)有机发光聚合物基器件。研究了分散液浓度和烷基链长对器件性能的影响。结果表明,OLED的性能与CNO纳米片的覆盖率,厚度和功函数值有关。在这四种剥落剂中,具有被TPAOH剥落的CNO纳米片的装置显示出最低的驱动电压。与具有常规EIL材料的8-喹啉锂相比,具有CNO纳米片EIL的OLED显示出较低的驱动电压。
更新日期:2018-07-26
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