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High Color Purity Lead-Free Perovskite Light-Emitting Diodes via Sn Stabilization.
Advanced Science ( IF 14.3 ) Pub Date : 2020-03-01 , DOI: 10.1002/advs.201903213 Hongyan Liang 1 , Fanglong Yuan 2 , Andrew Johnston 3 , Congcong Gao 1 , Hitarth Choubisa 3 , Yuan Gao 3 , Ya-Kun Wang 3 , Laxmi Kishore Sagar 3 , Bin Sun 3 , Peicheng Li 2 , Golam Bappi 3 , Bin Chen 3 , Jun Li 3 , Yunkun Wang 4 , Yitong Dong 3 , Dongxin Ma 3 , Yunan Gao 4 , Yongchang Liu 1 , Mingjian Yuan 5 , Makhsud I Saidaminov 3 , Sjoerd Hoogland 3 , Zheng-Hong Lu 2 , Edward H Sargent 3
Advanced Science ( IF 14.3 ) Pub Date : 2020-03-01 , DOI: 10.1002/advs.201903213 Hongyan Liang 1 , Fanglong Yuan 2 , Andrew Johnston 3 , Congcong Gao 1 , Hitarth Choubisa 3 , Yuan Gao 3 , Ya-Kun Wang 3 , Laxmi Kishore Sagar 3 , Bin Sun 3 , Peicheng Li 2 , Golam Bappi 3 , Bin Chen 3 , Jun Li 3 , Yunkun Wang 4 , Yitong Dong 3 , Dongxin Ma 3 , Yunan Gao 4 , Yongchang Liu 1 , Mingjian Yuan 5 , Makhsud I Saidaminov 3 , Sjoerd Hoogland 3 , Zheng-Hong Lu 2 , Edward H Sargent 3
Affiliation
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Perovskite-based light-emitting diodes (PeLEDs) are now approaching the upper limits of external quantum efficiency (EQE); however, their application is currently limited by reliance on lead and by inadequate color purity. The Rec. 2020 requires Commission Internationale de l'Eclairage coordinates of (0.708, 0.292) for red emitters, but present-day perovskite devices only achieve (0.71, 0.28). Here, lead-free PeLEDs are reported with color coordinates of (0.706, 0.294)-the highest purity reported among red PeLEDs. The variation of the emission spectrum is also evaluated as a function of temperature and applied potential, finding that emission redshifts by <3 nm under low temperature and by <0.3 nm V-1 with operating voltage. The prominent oxidation pathway of Sn is identified and this is suppressed with the aid of H3PO2. This strategy prevents the oxidation of the constituent precursors, through both its moderate reducing properties and through its forming complexes with the perovskite that increase the energetic barrier toward Sn oxidation. The H3PO2 additionally seeds crystal growth during film formation, improving film quality. PeLEDs are reported with an EQE of 0.3% and a brightness of 70 cd m-2; this is the record among reported red-emitting, lead-free PeLEDs.
中文翻译：
通过锡稳定化实现高颜色纯度无铅钙钛矿发光二极管。
基于钙钛矿的发光二极管（PeLED）现已接近外量子效率（EQE）的上限；然而，它们的应用目前由于对铅的依赖和色纯度不足而受到限制。推荐。2020 年，红色发射器要求国际照明委员会坐标为 (0.708, 0.292)，但目前的钙钛矿器件只能达到 (0.71, 0.28)。此处，无铅 PeLED 的色坐标为 (0.706, 0.294)，这是红色 PeLED 中报告的最高纯度。发射光谱的变化也被评估为温度和施加电势的函数，发现在低温下发射红移 <3 nm，在工作电压下发射红移 <0.3 nm V-1。确定了 Sn 的主要氧化途径，并借助 H3PO2 对其进行抑制。该策略通过其适度的还原特性以及通过与钙钛矿形成络合物来防止成分前体的氧化，从而增加锡氧化的能量势垒。H3PO2 在成膜过程中还促进晶体生长，从而提高薄膜质量。据报道，PeLED 的 EQE 为 0.3%，亮度为 70 cd m-2；这是已报道的红光无铅 PeLED 的记录。
更新日期：2020-04-21
中文翻译：
通过锡稳定化实现高颜色纯度无铅钙钛矿发光二极管。
基于钙钛矿的发光二极管（PeLED）现已接近外量子效率（EQE）的上限；然而，它们的应用目前由于对铅的依赖和色纯度不足而受到限制。推荐。2020 年，红色发射器要求国际照明委员会坐标为 (0.708, 0.292)，但目前的钙钛矿器件只能达到 (0.71, 0.28)。此处，无铅 PeLED 的色坐标为 (0.706, 0.294)，这是红色 PeLED 中报告的最高纯度。发射光谱的变化也被评估为温度和施加电势的函数，发现在低温下发射红移 <3 nm，在工作电压下发射红移 <0.3 nm V-1。确定了 Sn 的主要氧化途径，并借助 H3PO2 对其进行抑制。该策略通过其适度的还原特性以及通过与钙钛矿形成络合物来防止成分前体的氧化，从而增加锡氧化的能量势垒。H3PO2 在成膜过程中还促进晶体生长，从而提高薄膜质量。据报道，PeLED 的 EQE 为 0.3%，亮度为 70 cd m-2；这是已报道的红光无铅 PeLED 的记录。
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