光电子学
红外线的
量子点
发光二极管
材料科学
窗口(计算)
二极管
光子学
光学
纳米技术
物理
计算机科学
操作系统
作者
Maria Vasilopoulou,Hyeong Pil Kim,Byung Soon Kim,Michael Papadakis,Anderson Emanuel Ximim Gavim,Andréia G. Macedo,Wilson José da Silva,Fábio Kurt Schneider,Mohd Asri Mat Teridi,Athanassios G. Coutsolelos,Abd. Rashid bin Mohd Yusoff
标识
DOI:10.1038/s41566-019-0526-z
摘要
Semiconductor colloidal quantum dots (CQDs) offer size- and composition-tunable luminescence of high colour purity. Importantly, their emission can be tuned deep into the second biological near-infrared (NIR-II) window (1,000–1,700 nm). However, applications are hindered by the low efficiencies achieved to date. Here, we report NIR-II CQD light-emitting diodes with an external quantum efficiency of 16.98% and a power conversion efficiency of 11.28% at wavelength 1,397 nm. This performance arises from device engineering that delivers a high photoluminescence quantum yield and charge balance close to unity. More specifically, we employed a binary emissive layer consisting of silica-encapsulated silver sulfide (Ag2S@SiO2) CQDs dispersed in a caesium-containing triple cation perovskite matrix that serves as an additional passivation medium and a carrier supplier to the emitting CQDs. The hole-injection contact also features a thin porphyrin interlayer to balance the device current and enhance carrier radiative recombination. Semiconductor nanocrystals with efficient tunable emission in the 1,000–1,700 nm window could prove useful for applications in deep biological imaging and sensing.
科研通智能强力驱动
Strongly Powered by AbleSci AI