Bright and efficient light-emitting diodes based on perovskite quantum dots with formamidine-methylamine hybrid cations

Mei, Guanding1; Zhang, Yuniu1; Xu, Bing1; Liu, Haochen1; Zhong, Jialin1; Shi, Kanming1; Sun, Xiao Wei1; Wang, Kai1,2

2018-11-14

10.1088/1361-6463/aae1e8

JOURNAL OF PHYSICS D-APPLIED PHYSICS   影响因子和分区

0022-3727

1361-6463

Perovskites have become an excellent candidate for the next-generation optoelectronic semiconductor materials due to their attractive optoelectronic properties, such as size-dependent emission peak, narrow emission spectrum, and high luminescent efficiency. Herein, we present the synthesis of mixed-cation perovskite quantum dots (QDs) based on FA(x)MA((1-x))PbBr(3) (FA = CH(NH2)(2), MA = CH3NH2). By photoluminescence (PL) characterization, it shows that the perovskite QDs emit green light (similar to 530 nm) and measured high absolute quantum yield up to 88%. It is also found that the emission peak shows a blue-shift with the increase of MA(+) doping due to a contracted lattice structure. We also fabricated perovskite light-emitting diodes (PeLEDs) with FA(x)MA((1-x))PbBr(3) as the light-emitting layer. Ultraviolet photoelectron spectroscopy confirmed that the valence band of FA(x)MA((1-x))PbBr(3) decreases with MA content increases, which can reduce the hole injection barrier in related devices. As a result, we obtained light-emitting diodes with an optimized composition of synthesized materials FA(0.8)MA(0.1)PbBr(3) as the emitting layer exhibiting maximum luminance of 2020 cd . m(-2), a maximum current efficiency of 14.10 cd . A(-1) and an external quantum efficiency of 3.36%, which are more than two-fold that of the FAPbBr(3) PeLED, indicating that the doping of methylamine cations in FA-cation-based perovskites is a beneficial way to improve device performance.

perovskites quantum dots light emitting diode electroluminescence

SCI ; EI

英语

第一 ; 通讯

Tianjin New Materials Science and Technology Key Project[16ZXCLGX00040]

Physics

Physics, Applied

WOS:000446855600001

IOP PUBLISHING LTD

20184406003508

Charge injection ; Efficiency ; Electroluminescence ; Emission spectroscopy ; Light ; Light emitting diodes ; Nanocrystals ; Organic light emitting diodes (OLED) ; Perovskite ; Positive ions ; Semiconductor diodes ; Semiconductor doping ; Semiconductor quantum dots ; Ultraviolet photoelectron spectroscopy

Minerals:482.2 ; Semiconducting Materials:712.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Light, Optics and Optical Devices:741 ; Light/Optics:741.1 ; Nanotechnology:761 ; Production Engineering:913.1 ; Quantum Theory; Quantum Mechanics:931.4

PHYSICS

Web of Science

1.Southern Univ Sci & Technol, Shenzhen Key Lab Adv Quantum Dot Displays & Light, Dept Elect & Elect Engn, Shenzhen, Peoples R China
2.GaN Device Engn Technol Res Ctr Guangdong, Shenzhen, Guangdong, Peoples R China

Mei, Guanding,Zhang, Yuniu,Xu, Bing,et al. Bright and efficient light-emitting diodes based on perovskite quantum dots with formamidine-methylamine hybrid cations[J]. JOURNAL OF PHYSICS D-APPLIED PHYSICS,2018,51(45).

Mei, Guanding.,Zhang, Yuniu.,Xu, Bing.,Liu, Haochen.,Zhong, Jialin.,...&Wang, Kai.(2018).Bright and efficient light-emitting diodes based on perovskite quantum dots with formamidine-methylamine hybrid cations.JOURNAL OF PHYSICS D-APPLIED PHYSICS,51(45).

Mei, Guanding,et al."Bright and efficient light-emitting diodes based on perovskite quantum dots with formamidine-methylamine hybrid cations".JOURNAL OF PHYSICS D-APPLIED PHYSICS 51.45(2018).