Hot wind technique for high-efficiency, fully-solution-processed, multilayer organic light-emitting diodes

• Published in: Synthetic metals 2021-12, Vol.282, p.116950, Article 116950
• Main Authors: Niu, Mu-Chun, Lo, Pei-Hsuan, Chiu, Hao-Zhe, Chao, Yu-Chiang
• Format: Article
• Language: English
• Subjects: Current efficiency; Dissolution; Efficiency; Fully solution-processed; High performance; Hot wind technique; Light emitting diodes; Multilayer; Multilayers; Organic chemistry; Organic light emitting diodes; Quantum efficiency
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2021.116950

Multilayer organic light-emitting diodes (OLEDs) produced by the fully solution-processed method without the dissolution of subsequent layers are necessary to achieve cost-effective high performance devices. Although photo-cross-linkable organic molecules and orthogonal solvents are regarded as promising approaches to avoiding dissolution, fully solution-processed multilayer OLEDs do not demand their use, making it impossible to investigate them and limiting their progress. In this work, a simple technique by means of hot wind that requires only a spin coater and a heat gun and reduces the dissolution problem is developed to produce fully solution-processed multilayer OLEDs. Results show that the average current efficiency is about 18 cd/A and the external quantum efficiency is 6% for devices with areas of 0.4 × 0.4 and 1.4 × 1.4 cm2. [Display omitted] •A technique for multilayer organic light-emitting diodes was presented.•This technique requires only a spin coater and a heat gun to reduce the dissolution problem.•The average current efficiency is about 18 cd/A and the external quantum efficiency is 6% were obtained.