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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 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
DOIs	https://doi.org/10.1002/adom.202100393
Publication status	Published - 4 Nov 2021
Externally published	Yes

Keywords

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

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10.1002/adom.202100393

Cite this

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{5513c3f5f9a94fcebe140917e09d93d1,

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

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 Su, {Chun Jen} and Jeng, {U. Ser} and Wong, {Kam Sing} and Ng, {Alan Man Ching} and Meng Gu and Jasminka Popovi{\'c} and Djuri{\v s}i{\'c}, {Aleksandra B.}",

note = "Publisher Copyright: {\textcopyright} 2021 Wiley-VCH GmbH",

year = "2021",

month = nov,

day = "4",

doi = "10.1002/adom.202100393",

language = "English",

volume = "9",

journal = "Advanced Optical Materials",

issn = "2195-1071",

number = "21",

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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, CJ, Jeng, US, 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 - Ruddlesden–Popper

KW - X-ray diffraction

KW - green emission

KW - perovskite light-emitting diodes

KW - quasi-2D perovskites

UR - http://www.scopus.com/inward/record.url?scp=85113168645&partnerID=8YFLogxK

U2 - 10.1002/adom.202100393

DO - 10.1002/adom.202100393

M3 - Article

AN - SCOPUS:85113168645

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

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Keywords

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