Highly-efficient OLED with cesium fluoride electron injection layer. (September 2021)

• Record Type: Journal Article
• Authors: Kumar, Pankaj; Agrawal, Niraj; Pandey, VK; Gautam, A.K; Sharma, S.K; Chaudhary, SD
• Is Part Of: Solid-state electronics. Volume 183(2021)
• Publication Date: 2021-09
• Subjects: Organic light emitting diodes -- Solution process -- Electron injection -- Highly-efficient; Semiconductors -- Periodicals; Semiconducteurs -- Périodiques; 621.38152
• DOI: 10.1016/j.sse.2021.108031
• Languages: English
• ISSNs: 0038-1101

Abstract

Highlights: Efficient electron injection between aluminium cathode and organic layer should be analysed properly to enhance the performance of solution processable OLED. Employment of optimized EIL approach to enhance the performance in OLEDs applications. Optimized thickness of cesium fluoride provides improved performance of phosphorescent OLEDs improving the electron injection from metal cathode to electron transport layer to generate efficient excitons into emissive layer. Enhanced performance of solution processed phosphorescent green OLEDs with different thickness of cesium fluoride. Abstract: The effective electron-injecting layer (EIL) is one of the important factors in organic light-emitting diodes (OLEDs) to achieve high performance devices. Herein, we have proposed the modification in cesium fluoride thickness and demonstrated that the performance of OLED is enhanced while varying the thickness of EIL. The cesium fluoride thickness may greatly influence the electron injection ability from the cathode to electron transport layer (ETL). The optimized green phosphorescent OLED consisting CBP:Ir(ppy)3 emissive layer reveals forward viewing power efficiency (PE) of 46.3 lmW −1, current efficiency (CE) of 51.7 cdA -1 and external quantum efficiency (EQE) of 14.2%, at 100 cdm −2, which has enhancement of PE, CE, and EQE of 38.6%, 44.8%, and 46.4%, respectively at 100 cdm −2 . The thickness variation of cesium fluoride EIL resulted in very balanced electron injection which is also valid for other OLED devices. The employment of optimized EIL is a favourable approach to enhance the performance in OLEDs applications.