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Color-pure red light-emitting diodes based on two-dimensional lead-free perovskites.
Yuan, Fanglong; Zheng, Xiaopeng; Johnston, Andrew; Wang, Ya-Kun; Zhou, Chun; Dong, Yitong; Chen, Bin; Chen, Haijie; Fan, James Z; Sharma, Geetu; Li, Peicheng; Gao, Yuan; Voznyy, Oleksandr; Kung, Hao-Ting; Lu, Zheng-Hong; Bakr, Osman M; Sargent, Edward H.
Afiliação
  • Yuan F; Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario M5S 1A4, Canada.
  • Zheng X; Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario M5S 3E4, Canada.
  • Johnston A; Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia.
  • Wang YK; Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario M5S 1A4, Canada.
  • Zhou C; Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario M5S 1A4, Canada.
  • Dong Y; Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario M5S 1A4, Canada.
  • Chen B; Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario M5S 1A4, Canada.
  • Chen H; Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario M5S 1A4, Canada.
  • Fan JZ; Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario M5S 1A4, Canada.
  • Sharma G; Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario M5S 1A4, Canada.
  • Li P; Department of Physical and Environmental Sciences, University of Toronto, Scarborough 1065 Military Trail, Toronto, Ontario M1C 1A4, Canada.
  • Gao Y; Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario M5S 3E4, Canada.
  • Voznyy O; Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario M5S 1A4, Canada.
  • Kung HT; Department of Physical and Environmental Sciences, University of Toronto, Scarborough 1065 Military Trail, Toronto, Ontario M1C 1A4, Canada.
  • Lu ZH; Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario M5S 3E4, Canada.
  • Bakr OM; Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario M5S 3E4, Canada. zhenghong.lu@utoronto.ca osman.bakr@kaust.edu.sa ted.sargent@utoronto.ca.
  • Sargent EH; Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia. zhenghong.lu@utoronto.ca osman.bakr@kaust.edu.sa ted.sargent@utoronto.ca.
Sci Adv ; 6(42)2020 Oct.
Article em En | MEDLINE | ID: mdl-33055155
ABSTRACT
It remains a central challenge to the information display community to develop red light-emitting diodes (LEDs) that meet demanding color coordinate requirements for wide color gamut displays. Here, we report high-efficiency, lead-free (PEA)2SnI4 perovskite LEDs (PeLEDs) with color coordinates (0.708, 0.292) that fulfill the Rec. 2100 specification for red emitters. Using valeric acid (VA)-which we show to be strongly coordinated to Sn2+-we slow the crystallization rate of the perovskite, improving the film morphology. The incorporation of VA also protects tin from undesired oxidation during the film-forming process. The improved films and the reduced Sn4+ content enable PeLEDs with an external quantum efficiency of 5% and an operating half-life exceeding 15 hours at an initial brightness of 20 cd/m2 This work illustrates the potential of Cd- and Pb-free PeLEDs for display technology.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2020 Tipo de documento: Article
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2020 Tipo de documento: Article