In Situ Growth of Ultrapure Green‐Emitting FAPbBr<sub>3</sub>‐PVDF Films via a Synergetic Dual‐Additive Strategy for Wide Color Gamut Backlit Display
Changbin Yang, Weifan Niu, Renjing Chen, Tao Pang, Jidong Lin, Yongping Zheng, Ruidan Zhang, Zhibin Wang, Ping Huang, Feng Huang, Daqin Chen
Abstract
Abstract Elaborate engineering of emitting wavelength of green down‐converter in the spectral range of ≈ 525–535 nm with narrow full‐width at half‐maximum (fwhm < 25 nm) is an essential prerequisite for faithfully reproducing colors in the quantum dot (QD)‐based backlit display. Herein, different from the previous complex synthesis for green films, FAPbBr 3 perovskite QDs films are fabricated by a dual‐additive assisted in situ growth strategy. Both C 6 H 5 CH 2 CH 2 NH 3 + and 1,4,7,10,13,16‐hexaoxacyclooctadecane additives are introduced to synergistically tune green emitting ( ≈ 525–535 nm) with the narrowest fwhm down to 21 nm and the highest photoluminescence quantum yield (PLQY) up to 99%. Improved nanocomposite film with excellent long‐term stability is used to construct a prototype liquid crystal display (LCD) with a wide color gamut (118% National Television System Committee and 88% Recommendation BT 2020), a high saturation, and a remarkable color rendition. The performance is superior to that of the commercial white‐LED‐based LCD, showing a great potential of the present green film for high‐definition display application in the future.