High efficiency pure blue perovskite quantum dot light-emitting diodes based on formamidinium manipulating carrier dynamics and electron state filling

• Published in: Light, science & applications science & applications, 2022-12, Vol.11 (1), p.346-11, Article 346
• Main Authors: Gao, Long, Zhang, Yilin, Gou, Lijie, Wang, Qian, Wang, Meng, Zheng, Weitao, Wang, Yinghui, Yip, Hin-Lap, Zhang, Jiaqi
• Format: Article
• Language: English
• Subjects: 119/118; 140/125; 140/146; 639/624/1020/1089; 639/624/1075/401; 639/624/399/1017; 639/624/399/354; 639/766/1130/2799; Cations; Efficiency; Lasers; Light emitting diodes; Luminescence; Microwaves; Optical and Electronic Materials; Optical Devices; Optics; Photoelectric properties; Photonics; Photons; Physics; Physics and Astronomy; Quantum dots; Recombination; RF and Optical Engineering
• ISSN: 2047-7538; 2095-5545; 2047-7538
• DOI: 10.1038/s41377-022-00992-5

Achieving high efficiency and stable pure blue colloidal perovskite quantum dot (QD) light-emitting diodes (LEDs) is still an enormous challenge because blue emitters typically exhibit high defect density, low photoluminescence quantum yield (PLQY) and easy phase dissociation. Herein, an organic cation composition modification strategy is used to synthesize high-performance pure blue perovskite quantum dots at room temperature. The synthesized FA-CsPb(Cl 0.5 Br 0.5 ) 3 QDs show a bright photoluminescence with a high PLQY (65%), which is 6 times higher than the undoped samples. In addition, the photophysical properties of the FA cation doping was deeply illustrated through carrier dynamics and first principal calculation, which show lower defects, longer lifetime, and more reasonable band gap structure than undoped emitters. Consequently, pure blue FA-CsPb(Cl 0.5 Br 0.5 ) 3 QDs light-emitting devices were fabricated and presented a maximum luminance of 1452 cd m −2 , and an external quantum efficiency of 5.01 % with an emission at 474 nm. The excellent photoelectric properties mainly originate from the enhanced blue QDs emitter and effective charge injection and exciton radiation. Our finding underscores this easy and feasible room temperature doping approach as an alternative strategy to blue perovskite QD LED development. To gain an insight into the lattice and band structure of blue perovskite NC emitters, doping organic cations (FA + ) reduces nonradiative recombination at room temperature. The FA + significantly decreases exciton quenching and phonon energy scattering via manipulating hot carriers and electron filling in band structure.