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Efficient All-Inorganic Perovskite Light-Emitting Diodes with Improved Operation Stability
ACS Applied Materials & Interfaces ( IF 9.5 ) Pub Date : 2020-04-01 , DOI: 10.1021/acsami.9b23170
Guoqing Cheng 1, 2, 3 , Yan Liu 2, 3 , Tao Chen 1, 2, 3 , Wenjing Chen 2, 3 , Zhibin Fang 2, 3 , Ji Zhang 2, 3 , Liming Ding 4 , Xinhua Li 1 , Tongfei Shi 1 , Zhengguo Xiao 2, 3
Affiliation  

Stability is becoming a main issue for perovskite light-emitting diodes (PeLEDs), as their external quantum efficiency (EQE) has been boosted to above 20%. An all-inorganic perovskite, cesium lead iodide (CsPbI3), has better stability than organic–inorganic hybrid perovskites but suffers from a transition to yellow δ-CsPbI3 phase at room temperature. Herein, we report stabilization of the α-CsPbI3 phase by in situ formation of perovskite nanocrystals (NCs). By incorporation of a proper ratio of bulky organoammonium halides, 4-fluoro-phenylmethylammonium iodide (4-F-PMAI), stable α-CsPbI3 films with nanometer-sized crystals can be obtained using a one-step spin-coating approach. The PeLEDs using α-CsPbI3 NC films as emitters show a pure red emission at 692 nm and a high EQE of 14.8%. The EQE is further boosted to 18.6% using CsPbI2.8Br0.2 as the emissive layer. Furthermore, the PeLEDs show a very decent half-lifetime of over 1200 min and a shelf stability of over 2 months, much longer than that of hybrid PeLEDs.

中文翻译:

具有改善的工作稳定性的高效全无机钙钛矿发光二极管

钙钛矿发光二极管(PeLED)的稳定性已成为主要问题,因为其外部量子效率(EQE)已提高到20%以上。全-无机钙钛矿,铯碘化铅(CsPbI 3),具有比有机-无机混合钙钛矿但患有到黄色δ-CsPbI过渡更好的稳定性3在室温下的阶段。在本文中,我们报道了α-CsPbI稳定3通过在钙钛矿纳米晶体(NCS)的原位形成阶段。由笨重有机铵卤化物的适当比例,掺入4-氟phenylmethylammonium碘化物(4-F-PMAI),稳定α-CsPbI 3层可以使用单步旋涂法获得的膜具有纳米尺寸的晶体。使用α-CsPbI的PeLEDs 3NC膜作为发射器在692 nm处显示纯红色发射,并且EQE高达14.8%。使用CsPbI 2.8 Br 0.2作为发光层,EQE进一步提高到18.6%。此外,PeLED的半衰期非常长,超过1200分钟,货架稳定性超过2个月,比混合PeLED更长。
更新日期:2020-04-01
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