DataVXACS Energy LettersPaper
journal article·2021-07-09

Lead-Free Halide Light-Emitting Diodes with External Quantum Efficiency Exceeding 7% Using Host–Dopant Strategy

Gijun Seo, Hyocheol Jung, Tielyr D. Creason, Vishal Yeddu, Matthew Bamidele, Elena Echeverria, Jihoon Lee, David McIlroy, Bayram Saparov, Do Young Kim

ACS Energy Letters· Volume 6· Issue 7
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Source abstract

Abstract

Lead-free halide light-emitting diodes (LEDs) are fabricated using nontoxic and earth-abundant CsCu2I3 with a strong yellow emission at a peak wavelength of 568 nm. CsCu2I3-based host–dopant emitters are formed by vacuum thermal evaporation (VTE) film codeposition process instead of the commonly used solution-based film deposition process. Using the VTE process, extremely thin (30 nm) host–dopant emitters have successfully been formed with the CsCu2I3 dopant and various organic host molecules. A bright yellow emission with a photoluminescence quantum yield value of 84.8% is achieved in the 0.5% CsCu2I3-doped halide emitter film due to the successful spatial localization of charge carriers and excitons using an organic host with appropriate energy levels to CsCu2I3. With the further enhancement in charge balance using the cohost system, a record-breaking lead-free halide LED has been fabricated with an EQE of 7.4%. The lead-free halide LEDs are also highly stable in the device operation with LT70 of 20 h at 100 cd/m2.
Source: openalex_inverted_index · Quality: baseline

Research context

Materials processing

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials Science and Engineering, Oklahoma State University, 526 North Elgin Avenue, Tulsa, Oklahoma 74106, United States

Department of Polymer Science and Engineering, Korea National University of Transportation, Chungju, 27469, Republic of Korea

Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States

Department of Physics, Oklahoma State University, 145 Physical Science Building, Stillwater, Oklahoma 74078, United States

Department of IT·Energy Convergence, Korea National University of Transportation, Chungju, 27469, Republic of Korea

Funding

National Research Foundation of Korea · National Aeronautics and Space Administration · Oklahoma Center for the Advancement of Science and Technology

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