Energy and Charge Dual Transfer Engineering for High‐Performance Green Perovskite Light‐Emitting Diodes

• DOI: 10.1002/adfm.202112849
• Publication Date: 2022-02-19T09:18:28Z
• Authors: Hee Ju An; Sung Doo Baek; Do Hoon Kim; Jae‐Min Myoung
• Keywords: Quantum Efficiency

Abstract Perovskite light‐emitting diodes (PeLEDs) have garnered considerable interest in recent years owing to their unique optoelectronic properties. However, the performance of PeLEDs is limited by low quantum efficiency and unbalanced charge injection. In this study, address these issues, a novel co‐hole transport layer (HTL) 4,4′‐bis( N ‐carbazolyl)‐1,1′‐biphenyl (CBP) poly(9‐vinylcarbazole) (PVK) introduced into PeLEDs. By optimizing composition ratio CBP PVK, CsPbBr 3 ‐based significantly improved via efficient Förster resonant energy transfer an enhanced well‐aligned levels HTLs with emission layers. The PeLED optimized PVK 0.5 –CBP HTL exhibits best device luminance 31641 cd∙m −2 , current 39.2 cd∙A −1 external 15.4%. Thus, proposed strategy engineering dual expected be revolutionary field research.