量子点
费斯特共振能量转移
材料科学
光电子学
光致发光
量子产额
发光二极管
二极管
量子效率
薄膜
发光
荧光
纳米技术
光学
物理
作者
Heng Zhang,Qiang Su,Shuming Chen
标识
DOI:10.1002/adom.201902092
摘要
Abstract Colloidal II–VI quantum dots (QDs) exhibit near‐unity photoluminescence (PL) quantum yield (QY) when they are dissolved in dilute solution. However, when they are assembled into thin film, the PL QY is decreased significantly due to the presence of nonradiative Förster resonance energy transfer (FRET) among the close‐packed QDs. In this work, the FRET is suppressed by developing a binary‐QD light emission layer (EML), where blue‐QDs are introduced as spacers to spatially separate the red‐QDs. Due to the separation of red‐QDs, the FRET among red‐QDs is effectively suppressed and thus the emission properties of red‐QDs are well preserved. As a result, the PL QY of red‐QD thin film is enhanced by 1.5 times. When the binary‐QD EML is integrated into devices, the resultant QD light‐emitting diodes (QLEDs) exhibit a high external quantum efficiency of 21.64%. The work offers a new, simple and effective approach to suppress the FRET and improve the QY of QD thin film, which may open up a new avenue for developing efficient QLEDs with near‐unity internal quantum efficiency.
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