Perovskite templating via a bathophenanthroline additive for efficient light-emitting devices

• Main Authors: Jamaludin, Nur Fadilah, Yantara, Natalia, Ng, Yan Fong, Bruno, Annalisa, Chandran, Bevita K., Chin, Xin Yu, Thirumal, Krishnamoorthy, Mathews, Nripan, Soci, Cesare, Mhaisalkar, Subodh
• Other Authors: School of Materials Science & Engineering
• Format: Article
• Language: English
• Published: 2019
• Subjects: Science::Physics; Perovskites; Light Emission
• Online Access: https://hdl.handle.net/10356/85191; http://hdl.handle.net/10220/50268
• Institution: Nanyang Technological University

Identified as emerging light absorbers due to their plethora of unique optoelectronic properties, perovskites have also been touted as a promising candidate for light emission. However, despite the effortless transition of perovskites into the current organic light-emitting diodes (OLEDs), misalignment of energy levels at the hole transporting material (HTM) and perovskite interface limits the efficacy of interfacial charge transport. Herein, it is shown that by incorporating a small organic molecule, bathophenanthroline (BPhen), into the CH3NH3PbBr3 emitter via a solvent engineering technique, the energy band levels of the perovskite can be tailored and the energy mismatch at the HTM/perovskite interface can be ameliorated through the formation of a graded emitter layer and accompanying morphological improvements. With a BPhen concentration of 0.500 mg mL−1, more than ten-fold enhancement of device luminance and efficiency was achieved, thus demonstrating a facile and viable approach for fabricating high-performance perovskite light-emitting diodes (PeLEDs).