Enhanced Light Emission Performance of Mixed Cation Perovskite Films—The Effect of Solution Stoichiometry on Crystallization

Fangzhou Liu; Xinshun Qin; Bing Han; Christopher C. S. Chan; Chao Ma; Tik Lun Leung; Wei Chen; Yanling He; Ivor Lončarić; Luca Grisanti; Juraj Ovčar; Željko Skoko; Yingli Shi; Francis Chi Chung Ling; Md Rashedul Huqe; Juan Antonio Zapien; Shixun Wang; Chun-Jen Su; U-Ser Jeng; Kam Sing Wong; Alan Man Ching Ng; Meng Gu; Jasminka Popović; Aleksandra B. Djurišić

doi:10.1002/adom.202100393

Enhanced Light Emission Performance of Mixed Cation Perovskite Films—The Effect of Solution Stoichiometry on Crystallization

Fangzhou Liu
, Xinshun Qin
, Bing Han^*
, Christopher C. S. Chan
, Chao Ma
, Tik Lun Leung
, Wei Chen
, Yanling He
, Ivor Lončarić
, Luca Grisanti
, Juraj Ovčar
, Željko Skoko
, Yingli Shi
, Francis Chi Chung Ling
, Md Rashedul Huqe
, Juan Antonio Zapien
, Shixun Wang
, Chun-Jen Su
, U-Ser Jeng
, Kam Sing Wong

Alan Man Ching Ng, Meng Gu, Jasminka Popović^*, Aleksandra B. Djurišić^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

5 Citations (Scopus)

Abstract

The performance of quasi-2D perovskite light emitting diodes (LEDs) with mixed small cations, cesium and formamidinium (FA), is significantly affected by their ratio. The best devices obtained for Cs:FA ratio of 1:1 exhibit a maximum external quantum efficiency (EQE) of 12.1%, maximum luminance of 15 070 cd m⁻² and maximum current efficiency of 46.1 cd A⁻¹, which is significantly higher (about 3 times) compared to devices with FA only (maximum EQE of 4.1%, maximum luminance of 4521 cd m⁻²) and Cs-only (maximum EQE of 4.0%, maximum luminance of 4886 cd m⁻²). The photoluminescence quantum yield of the Cs:FA 1:1 sample is similarly enhanced, 21.3% compared 5.4% and 6%, for FA-only and Cs-only samples, respectively. It can be observed that the Cs:FA ratio significantly affects the crystallization of the perovskite, with the optimal 1:1 ratio resulting in the formation of tetragonal Cs_0.5FA_0.5PbBr₃ phase (different from cubic FAPbBr₃ and orthorhombic CsPbBr₃) with pronounced preferential orientation as well as a significant reduction in the trap density, which leads to a substantial improvement in the light-emitting performance.

Original language	English
Article number	2100393
Journal	Advanced Optical Materials
Volume	9
Issue number	21
Online published	20 Aug 2021
DOIs	https://doi.org/10.1002/adom.202100393
Publication status	Published - 4 Nov 2021

Research Keywords

green emission
perovskite light-emitting diodes
quasi-2D perovskites
Ruddlesden–Popper
X-ray diffraction

RGC Funding Information

RGC-funded

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10.1002/adom.202100393

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Liu, F., Qin, X., Han, B., Chan, C. C. S., Ma, C., Leung, T. L., Chen, W., He, Y., Lončarić, I., Grisanti, L., Ovčar, J., Skoko, Ž., Shi, Y., Ling, F. C. C., Huqe, M. R., Zapien, J. A., Wang, S., Su, C.-J., Jeng, U.-S., ... Djurišić, A. B. (2021). Enhanced Light Emission Performance of Mixed Cation Perovskite Films—The Effect of Solution Stoichiometry on Crystallization. Advanced Optical Materials, 9(21), Article 2100393. https://doi.org/10.1002/adom.202100393

@article{7118da3a9c3a4251bab6a2a8cd9deec2,

title = "Enhanced Light Emission Performance of Mixed Cation Perovskite Films—The Effect of Solution Stoichiometry on Crystallization",

abstract = "The performance of quasi-2D perovskite light emitting diodes (LEDs) with mixed small cations, cesium and formamidinium (FA), is significantly affected by their ratio. The best devices obtained for Cs:FA ratio of 1:1 exhibit a maximum external quantum efficiency (EQE) of 12.1\%, maximum luminance of 15 070 cd m−2 and maximum current efficiency of 46.1 cd A−1, which is significantly higher (about 3 times) compared to devices with FA only (maximum EQE of 4.1\%, maximum luminance of 4521 cd m−2) and Cs-only (maximum EQE of 4.0\%, maximum luminance of 4886 cd m−2). The photoluminescence quantum yield of the Cs:FA 1:1 sample is similarly enhanced, 21.3\% compared 5.4\% and 6\%, for FA-only and Cs-only samples, respectively. It can be observed that the Cs:FA ratio significantly affects the crystallization of the perovskite, with the optimal 1:1 ratio resulting in the formation of tetragonal Cs0.5FA0.5PbBr3 phase (different from cubic FAPbBr3 and orthorhombic CsPbBr3) with pronounced preferential orientation as well as a significant reduction in the trap density, which leads to a substantial improvement in the light-emitting performance.",

keywords = "green emission, perovskite light-emitting diodes, quasi-2D perovskites, Ruddlesden–Popper, X-ray diffraction",

author = "Fangzhou Liu and Xinshun Qin and Bing Han and Chan, \{Christopher C. S.\} and Chao Ma and Leung, \{Tik Lun\} and Wei Chen and Yanling He and Ivor Lon{\v c}ari{\'c} and Luca Grisanti and Juraj Ov{\v c}ar and {\v Z}eljko Skoko and Yingli Shi and Ling, \{Francis Chi Chung\} and Huqe, \{Md Rashedul\} and Zapien, \{Juan Antonio\} and Shixun Wang and Chun-Jen Su and U-Ser Jeng and Wong, \{Kam Sing\} and Ng, \{Alan Man Ching\} and Meng Gu and Jasminka Popovi{\'c} and Djuri{\v s}i{\'c}, \{Aleksandra B.\}",

year = "2021",

month = nov,

day = "4",

doi = "10.1002/adom.202100393",

language = "English",

volume = "9",

journal = "Advanced Optical Materials",

issn = "2195-1071",

publisher = "John Wiley \& Sons",

number = "21",

}

Liu, F, Qin, X, Han, B, Chan, CCS, Ma, C, Leung, TL, Chen, W, He, Y, Lončarić, I, Grisanti, L, Ovčar, J, Skoko, Ž, Shi, Y, Ling, FCC, Huqe, MR , Zapien, JA , Wang, S, Su, C-J, Jeng, U-S, Wong, KS, Ng, AMC, Gu, M, Popović, J & Djurišić, AB 2021, 'Enhanced Light Emission Performance of Mixed Cation Perovskite Films—The Effect of Solution Stoichiometry on Crystallization', Advanced Optical Materials, vol. 9, no. 21, 2100393. https://doi.org/10.1002/adom.202100393

TY - JOUR

T1 - Enhanced Light Emission Performance of Mixed Cation Perovskite Films—The Effect of Solution Stoichiometry on Crystallization

AU - Liu, Fangzhou

AU - Qin, Xinshun

AU - Han, Bing

AU - Chan, Christopher C. S.

AU - Ma, Chao

AU - Leung, Tik Lun

AU - Chen, Wei

AU - He, Yanling

AU - Lončarić, Ivor

AU - Grisanti, Luca

AU - Ovčar, Juraj

AU - Skoko, Željko

AU - Shi, Yingli

AU - Ling, Francis Chi Chung

AU - Huqe, Md Rashedul

AU - Zapien, Juan Antonio

AU - Wang, Shixun

AU - Su, Chun-Jen

AU - Jeng, U-Ser

AU - Wong, Kam Sing

AU - Ng, Alan Man Ching

AU - Gu, Meng

AU - Popović, Jasminka

AU - Djurišić, Aleksandra B.

PY - 2021/11/4

Y1 - 2021/11/4

N2 - The performance of quasi-2D perovskite light emitting diodes (LEDs) with mixed small cations, cesium and formamidinium (FA), is significantly affected by their ratio. The best devices obtained for Cs:FA ratio of 1:1 exhibit a maximum external quantum efficiency (EQE) of 12.1%, maximum luminance of 15 070 cd m−2 and maximum current efficiency of 46.1 cd A−1, which is significantly higher (about 3 times) compared to devices with FA only (maximum EQE of 4.1%, maximum luminance of 4521 cd m−2) and Cs-only (maximum EQE of 4.0%, maximum luminance of 4886 cd m−2). The photoluminescence quantum yield of the Cs:FA 1:1 sample is similarly enhanced, 21.3% compared 5.4% and 6%, for FA-only and Cs-only samples, respectively. It can be observed that the Cs:FA ratio significantly affects the crystallization of the perovskite, with the optimal 1:1 ratio resulting in the formation of tetragonal Cs0.5FA0.5PbBr3 phase (different from cubic FAPbBr3 and orthorhombic CsPbBr3) with pronounced preferential orientation as well as a significant reduction in the trap density, which leads to a substantial improvement in the light-emitting performance.

AB - The performance of quasi-2D perovskite light emitting diodes (LEDs) with mixed small cations, cesium and formamidinium (FA), is significantly affected by their ratio. The best devices obtained for Cs:FA ratio of 1:1 exhibit a maximum external quantum efficiency (EQE) of 12.1%, maximum luminance of 15 070 cd m−2 and maximum current efficiency of 46.1 cd A−1, which is significantly higher (about 3 times) compared to devices with FA only (maximum EQE of 4.1%, maximum luminance of 4521 cd m−2) and Cs-only (maximum EQE of 4.0%, maximum luminance of 4886 cd m−2). The photoluminescence quantum yield of the Cs:FA 1:1 sample is similarly enhanced, 21.3% compared 5.4% and 6%, for FA-only and Cs-only samples, respectively. It can be observed that the Cs:FA ratio significantly affects the crystallization of the perovskite, with the optimal 1:1 ratio resulting in the formation of tetragonal Cs0.5FA0.5PbBr3 phase (different from cubic FAPbBr3 and orthorhombic CsPbBr3) with pronounced preferential orientation as well as a significant reduction in the trap density, which leads to a substantial improvement in the light-emitting performance.

KW - green emission

KW - perovskite light-emitting diodes

KW - quasi-2D perovskites

KW - Ruddlesden–Popper

KW - X-ray diffraction

UR - https://www.scopus.com/pages/publications/85113168645

UR - https://www.scopus.com/pages/publications/85113168645#tab=impact

U2 - 10.1002/adom.202100393

DO - 10.1002/adom.202100393

M3 - RGC 21 - Publication in refereed journal

SN - 2195-1071

VL - 9

JO - Advanced Optical Materials

JF - Advanced Optical Materials

IS - 21

M1 - 2100393

ER -

Enhanced Light Emission Performance of Mixed Cation Perovskite Films—The Effect of Solution Stoichiometry on Crystallization

Abstract

Research Keywords

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GRF: Dion-Jacobson Metal Halide Perovskites for Improved Stability Perovskite LEDs

GRF: Quantitative Optical Characterization of Temperature Effects in Plasmonic Metamaterials: A Synergetic Spectroscopic-Ellipsometry and Finite-Difference-Time-Domain Approach

Cite this

Enhanced Light Emission Performance of Mixed Cation Perovskite Films—The Effect of Solution Stoichiometry on Crystallization

Abstract

Research Keywords

RGC Funding Information

Access Output

Other Access Options

Permanent Link

Other Files and Links

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Projects

GRF: Dion-Jacobson Metal Halide Perovskites for Improved Stability Perovskite LEDs

GRF: Quantitative Optical Characterization of Temperature Effects in Plasmonic Metamaterials: A Synergetic Spectroscopic-Ellipsometry and Finite-Difference-Time-Domain Approach

Cite this