TY - JOUR
T1 - Stable, Efficient Near-Infrared Light-Emitting Diodes Enabled by α/δ Phase Modulation
AU - Qiu, Jingjing
AU - Tang, Lianqi
AU - Xia, Yingdong
AU - Guo, Jia
AU - Xing, Guichuan
AU - Wang, Fu
AU - Dong, Qingfeng
AU - Chen, Yonghua
AU - Huang, Wei
N1 - Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/5/2
Y1 - 2019/5/2
N2 - Although formamidinium lead iodide (FAPbI 3 ) perovskite shows excellent prospects in the field of optoelectronics, it is limited by the conversion of the black perovskite phase (α-FAPbI 3 ) to the yellow non-perovskite phase (δ-FAPbI 3 ). Here, we first introduce diamine cations [EDBE, 2,2-(ethylenedioxy)bis(ethylamine)] into FAPbI 3 for stable and efficient near-infrared perovskite light-emitting diodes (NIR PeLEDs). By rationally regulating the α/δ phase, we have successfully prepared a NIR PeLED with an external quantum efficiency (EQE) of ≤11.40%. In addition, the perovskite film has excellent stability and does not undergo any significant change after being in air for 270 days. These results show that the introduction of EDBE reduces the formation energy of α-FAPbI 3 perovskite and the hydrogen bonds formed between adjacent EDBE molecules increase the stability of the perovskite devices. This work could help guide the phase transition mechanism of FAPbI 3 and further improve the performance of LEDs.
AB - Although formamidinium lead iodide (FAPbI 3 ) perovskite shows excellent prospects in the field of optoelectronics, it is limited by the conversion of the black perovskite phase (α-FAPbI 3 ) to the yellow non-perovskite phase (δ-FAPbI 3 ). Here, we first introduce diamine cations [EDBE, 2,2-(ethylenedioxy)bis(ethylamine)] into FAPbI 3 for stable and efficient near-infrared perovskite light-emitting diodes (NIR PeLEDs). By rationally regulating the α/δ phase, we have successfully prepared a NIR PeLED with an external quantum efficiency (EQE) of ≤11.40%. In addition, the perovskite film has excellent stability and does not undergo any significant change after being in air for 270 days. These results show that the introduction of EDBE reduces the formation energy of α-FAPbI 3 perovskite and the hydrogen bonds formed between adjacent EDBE molecules increase the stability of the perovskite devices. This work could help guide the phase transition mechanism of FAPbI 3 and further improve the performance of LEDs.
UR - http://www.scopus.com/inward/record.url?scp=85065064921&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.9b00587
DO - 10.1021/acs.jpclett.9b00587
M3 - 文章
C2 - 30974937
AN - SCOPUS:85065064921
SN - 1948-7185
VL - 10
SP - 2101
EP - 2107
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 9
ER -