Nanosecond‐Pulsed Perovskite Light‐Emitting Diodes at High Current Density
Nanosecond‐Pulsed Perovskite Light‐Emitting Diodes at High Current Density
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DOI：
10.1002/adma.202104867
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发表时间：
2021-09
影响因子：
29.4
通讯作者：
Lianfeng Zhao;K. Roh;S. Kacmoli;Khaled Al Kurdi;Xiao Liu;S. Barlow;S. Marder;C. Gmachl;Barry P Rand
中科院分区：
文献类型：
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作者：
Lianfeng Zhao;K. Roh;S. Kacmoli;Khaled Al Kurdi;Xiao Liu;S. Barlow;S. Marder;C. Gmachl;Barry P Rand
虽然金属卤化物钙钛矿发光二极管（PeLED）具有新一代显示和照明技术的潜力，但其缓慢的操作速度和响应时间限制了其应用范围。在这里，通过改进的器件配置设计和材料考虑，报告了由上升时间为1.2 ns的纳秒电脉冲驱动的高速PeLED，在8.3 kA cm-2处的最大辐射率约为480 kW Sr-1 m-2，在约10 kA cm-2处的外量子效率（EQE）为1%。通过PeLED的快速操作，时间响应提供了在电激发下的瞬态电荷载流子动力学，揭示了几种新的电致发光猝灭途径。最后，研究了集成分布反馈（DFB）光栅，其促进了更定向的光发射，在8.5 kA cm−2处的最大辐射率约为1200 kW sr−1 m−2，向前辐射输出增强了两倍以上。
While metal‐halide perovskite light‐emitting diodes (PeLEDs) hold the potential for a new generation of display and lighting technology, their slow operation speed and response time limit their application scope. Here, high‐speed PeLEDs driven by nanosecond electrical pulses with a rise time of 1.2 ns are reported with a maximum radiance of approximately 480 kW sr−1 m−2 at 8.3 kA cm−2, and an external quantum efficiency (EQE) of 1% at approximately 10 kA cm−2, through improved device configuration designs and material considerations. Enabled by the fast operation of PeLEDs, the temporal response provides access to transient charge carrier dynamics under electrical excitation, revealing several new electroluminescence quenching pathways. Finally, integrated distributed feedback (DFB) gratings are explored, which facilitate more directional light emission with a maximum radiance of approximately 1200 kW sr−1 m−2 at 8.5 kA cm−2, a more than two‐fold enhancement to forward radiation output.