In Situ Fabrication of Multi‐Site Contacted Perovskite/Organic Hybrid Color Converter for Indoor Lighting and Light Communication

Abstract Designing fast‐response and efficient color converter is of significance for indoor white light‐emitting diode (WLED) lighting and visible light communication (i.e., Light Fidelity, LiFi) application. Green‐emitting CsPbBr 3 quantum dots combined with red organic emitters are promising candidates. However, organic emitters cannot offer an adequate red emission intensity when they have a low weight fraction in the color converter. Herein, a multi‐site contacted CsPbBr 3 /organic color converter is fabricated with an efficient red emission via an in situ solid‐phase fabrication technique. It is found that the multi‐site contacted color converter has a 2.1 times higher red emission intensity compared to the physically mixed hybrid due to a more efficient energy transfer from CsPbBr 3 to organic emitters. Resultantly, the multi‐site contacted WLED exhibits a color rendering index (CRI) of 86 and a luminous efficacy (LE) of 100 lm W −1 , which are much higher than the physically mixed hybrid with a CRI of 49 and a LE of 60 lm W −1 . In addition, WLEDs present a superior visible light communication capability, evidenced by an opened‐eye diagram at the data rate of 5 Mbps. This study indicates the design and fabrication of perovskite/organic color converter are significant for constructing efficient and fast‐response WLEDs for the indoor LiFi application.