用于黄色和白色有机发光二极管的蓝色发光复合物。

IF 4.1 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Frontiers of Optoelectronics Pub Date : 2023-12-14 DOI:10.1007/s12200-023-00101-3
Kavya Rajeev, C K Vipin, Anjali K Sajeev, Atul Shukla, Sarah K M McGregor, Shih-Chun Lo, Ebinazar B Namdas, K N Narayanan Unni
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引用次数: 0

摘要

白色有机发光二极管(WOLED)具有多种理想特性,但由于蓝光发射器的稳定性差以及器件结构复杂导致生产成本高昂,其商业化受到阻碍。在此,我们研究了一种标准的蓝色发射空穴传输材料(HTM)N,N'-双(萘-1-基)-N,N'-双(苯基)联苯胺(NPB)及其与合适的电子传输材料(ETM)3-(联苯-4-基)-5-(4-叔丁基苯基)-4-苯基-4H-1,2,4-三唑(TAZ)结合后的复合发射。通过使用 NPB:TAZ 混合层作为蓝色发光体以及黄色磷光掺杂剂双(4-苯基噻吩并[3,2-c]吡啶-N,C2')乙酰丙酮铱(III)(PO-01)的宿主,开发出器件结构简单的蓝色和黄色有机发光二极管。然后,战略性的器件设计利用廿四碳烯作为间隔层的极性电荷传输特性,将这些蓝色和黄色发光单元连接起来。与使用传统电荷发生层(CGL)的器件相比,廿四碳烯连接器件的效果更佳。对间隔层的明智选择既能防止激子从蓝色发射单元扩散,又能促进电荷载流子向黄色发射单元传输,从而形成更多的簇合物。间隔物的这种互补行为改善了蓝光发射特性,同时也产生了合理的黄光发射。整体白光发射特性得到增强,实现了与日光相似的 CIE 坐标(0.36, 0.39)和色温(4643 K)。在有机发光二极管中采用分子间复合发射,通过其作为宿主和发射器的双重功能简化了器件结构。
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Blue emitting exciplex for yellow and white organic light-emitting diodes.

White organic light-emitting diodes (WOLEDs) have several desirable features, but their commercialization is hindered by the poor stability of blue light emitters and high production costs due to complicated device structures. Herein, we investigate a standard blue emitting hole transporting material (HTM) N,N'-bis(naphthalen-1-yl)-N,N'-bis(phenyl)benzidine (NPB) and its exciplex emission upon combining with a suitable electron transporting material (ETM), 3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole (TAZ). Blue and yellow OLEDs with simple device structures are developed by using a blend layer, NPB:TAZ, as a blue emitter as well as a host for yellow phosphorescent dopant iridium (III) bis(4-phenylthieno[3,2-c]pyridinato-N,C2')acetylacetonate (PO-01). Strategic device design then exploits the ambipolar charge transport properties of tetracene as a spacer layer to connect these blue and yellow emitting units. The tetracene-linked device demonstrates more promising results compared to those using a conventional charge generation layer (CGL). Judicious choice of the spacer prevents exciton diffusion from the blue emitter unit, yet facilitates charge carrier transport to the yellow emitter unit to enable additional exciplex formation. This complementary behavior of the spacer improves the blue emission properties concomitantly yielding reasonable yellow emission. The overall white light emission properties are enhanced, achieving CIE coordinates (0.36, 0.39) and color temperature (4643 K) similar to daylight. Employing intermolecular exciplex emission in OLEDs simplifies the device architecture via its dual functionality as a host and as an emitter.

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来源期刊
Frontiers of Optoelectronics
Frontiers of Optoelectronics ENGINEERING, ELECTRICAL & ELECTRONIC-
CiteScore
7.80
自引率
0.00%
发文量
583
期刊介绍: Frontiers of Optoelectronics seeks to provide a multidisciplinary forum for a broad mix of peer-reviewed academic papers in order to promote rapid communication and exchange between researchers in China and abroad. It introduces and reflects significant achievements being made in the field of photonics or optoelectronics. The topics include, but are not limited to, semiconductor optoelectronics, nano-photonics, information photonics, energy photonics, ultrafast photonics, biomedical photonics, nonlinear photonics, fiber optics, laser and terahertz technology and intelligent photonics. The journal publishes reviews, research articles, letters, comments, special issues and so on. Frontiers of Optoelectronics especially encourages papers from new emerging and multidisciplinary areas, papers reflecting the international trends of research and development, and on special topics reporting progress made in the field of optoelectronics. All published papers will reflect the original thoughts of researchers and practitioners on basic theories, design and new technology in optoelectronics. Frontiers of Optoelectronics is strictly peer-reviewed and only accepts original submissions in English. It is a fully OA journal and the APCs are covered by Higher Education Press and Huazhong University of Science and Technology. ● Presents the latest developments in optoelectronics and optics ● Emphasizes the latest developments of new optoelectronic materials, devices, systems and applications ● Covers industrial photonics, information photonics, biomedical photonics, energy photonics, laser and terahertz technology, and more
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