Highly Bright and Stable Lead-Free Double Perovskite White Light-Emitting Diodes

Shilin Jin; He Yuan; Tao Pang; Manjia Zhang; Junyang Li; Yuanhui Zheng; Tianmin Wu; Ruidan Zhang; Zhibin Wang; Daqin Chen

doi:10.1002/adma.202308487

Highly Bright and Stable Lead-Free Double Perovskite White Light-Emitting Diodes

Adv Mater. 2024 Jan;36(4):e2308487. doi: 10.1002/adma.202308487. Epub 2023 Dec 7.

Authors

Shilin Jin¹, He Yuan¹, Tao Pang², Manjia Zhang¹, Junyang Li¹, Yuanhui Zheng^{3

4}, Tianmin Wu⁵, Ruidan Zhang¹, Zhibin Wang¹, Daqin Chen^{1

3

6

7}

Affiliations

¹ College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian, 350117, P. R. China.
² Huzhou Key Laboratory of Materials for Energy Conversion and Storage, College of Science, Huzhou University, Huzhou, Zhejiang, 313000, China.
³ Fujian Science and Technology Innovation Laboratory for Optoelectronic Information, Fuzhou, Fujian, 350116, P. R. China.
⁴ College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350116, P. R. China.
⁵ Key Laboratory of Opto-Electronic Science and Technology for Medicine of Ministry of Education, College of Photonic and Electronic Engineering, Fujian Normal University, Fuzhou, Fujian, 350117, China.
⁶ Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering, Fujian Normal University, Fuzhou, Fujian, 350117, P. R. China.
⁷ Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage, Fujian Normal University, Fuzhou, Fujian, 350117, P. R. China.

PMID: 37918976
DOI: 10.1002/adma.202308487

Abstract

Lead-free double perovskites (DPs) are emerging highly stable emitters with efficient broadband self-trapped exciton (STE) photoluminescence (PL), but their low electroluminescent (EL) efficiency is a critical shortcoming. This work promotes the external quantum efficiency (EQE) and luminance of DP-based white light-emitting diode (wLED) with a normal device structure to 0.76% and 2793 cd m^-2 via two modifications: This work prevents the formation of adverse metallic silver, spatially confined STE, and lowers local site symmetry in Cs₂ Na_0.4 Ag_0.6 In_0.97 Bi_0.03 Cl₆ DP by terbium doping; and this work develops a guest-host strategy to improve film morphology, reduce defect density, and increase carrier mobility. These alterations cause substantial increase in STE radiative recombination and charge injection efficiency of perovskite layer. Finally, pure white EL with ideal color coordinates of (0.328, 0.329) and a record-breaking optoelectronic performance is achieved by introducing additional green carbon dots in LED to fill the deficient green component.

Keywords: lanthanide dopants; lead-free double perovskites; light-emitting diodes; quantum dots; self-trapped excitons.

Abstract

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