Self-assembled monolayer–based blue perovskite LEDs-Reference-Cited by-同舟云学术

Self-assembled monolayer–based blue perovskite LEDs

Published:2023-09-08 Issue:36 Volume:9 Page:
ISSN:2375-2548
Container-title:Science Advances
language:en
Short-container-title:Sci. Adv.

Author:

Wang Ya-Kun¹²^ORCID,Jia Fengyan¹³^ORCID,Li Xiaoyue⁴,Teale Sam¹^ORCID,Xia Pan¹^ORCID,Liu Yuan¹,Chan Phoebe Tsz-shan⁵,Wan Haoyue¹^ORCID,Hassan Yasser¹⁶,Imran Muhammad¹^ORCID,Chen Hao¹^ORCID,Grater Luke¹^ORCID,Sun Ling-Dong³^ORCID,Walker Gilbert C.⁵^ORCID,Hoogland Sjoerd¹^ORCID,Lu Zheng-Hong⁴^ORCID,Yan Chun-Hua³^ORCID,Liao Liang-Sheng²^ORCID,Sargent Edward H.¹^ORCID

Affiliation:

1. Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario M5S 3G4, Canada.

2. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, PR China.

3. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.

4. Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario M5S 3E4, Canada.

5. Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada.

6. Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, P.O. Box: 2713, Doha, Qatar.

Abstract

Blue perovskite light-emitting diodes (LEDs) have shown external quantum efficiencies (EQEs) of more than 10%; however, devices that emit in the true blue—those that accord with the emission wavelength required for Rec. 2100 primary blue —have so far been limited to EQEs of ~6%. We focused here on true blue emitting CsPbBr 3 colloidal nanocrystals (c-NCs), finding in early studies that they suffer from a high charge injection barrier, a problem exacerbated in films containing multiple layers of nanocrystals. We introduce a self-assembled monolayer (SAM) active layer that improves charge injection. We identified a bifunctional capping ligand that simultaneously enables the self-assembly of CsPbBr 3 c-NCs while passivating surface traps. We report, as a result, SAM-based LEDs exhibit a champion EQE of ~12% [CIE of (0.132, 0.069) at 4.0 V with a luminance of 11 cd/m 2 ], and 10-fold–enhanced operating stability relative to the best previously reported Rec. 2100-blue perovskite LEDs.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Link

https://www.science.org/doi/pdf/10.1126/sciadv.adh2140

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