journal article·2024-05

Narrow‐Band Green‐Emitting Hybrid Organic–Inorganic Eu (II)‐Iodides for Next‐Generation Micro‐LED Displays

Kai Han, Jiance Jin, Xinquan Zhou, Yan Duan, Maksym V. Kovalenko, Zhiguo Xia

Advanced Materials· Volume 36· Issue 21
Publisher page

Abstract

Abstract Low‐dimensional metal halide perovskites are an emerging class of light‐emitting materials for LED‐based displays; however, their B‐site cations are confined to ns2, d5, and d10 metals. Here, the design of divalent rare earth ions at B‐site is presented and a novel Eu(II)‐based iodide hybrid is reported with efficient (PLQY ≈98%) narrow‐band (FWHM ≈43 nm) green emission and high thermal stability (97%@150 °C). Owing to reduced lattice vibrations and shrunken average distance of Eu(II)‐iodide bonds in the face‐sharing 1D‐structure, photoluminescence from Eu(II) 4f‐5d transition appears along with elevated crystal‐field splitting of 5d energy level. The Eu(II)‐based iodide hybrid is further demonstrated for color‐pure green phosphor‐converted LEDs with a maximum brightness of ≈396 000 cd m−2 and photoelectric efficiency of 29.2%. High‐resolution micrometer‐scale light‐emitting diode (micro‐LED) displays (2540 PPI) via the solution‐processed screen is also presented. This work thus showcases a compelling narrow‐band green emitter for commercial micro‐LED displays.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Luminescence Properties of Advanced Materials · Solid-state spectroscopy and crystallography

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

Affiliations

The State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques Guangdong Engineering Technology Research and Development Centre of Special Optical Fiber Materials and Devices School of Materials Science and Engineering South China University of Technology Guangzhou 510641 China

Spin‐X Institute South China University of Technology Guangzhou 510641 China

Department of Chemistry and Applied Biosciences Institute of Inorganic Chemistry ETH Zürich Zürich 8093 Switzerland

Laboratory for Thin Films and Photovoltaics Empa‐Swiss Federal Laboratories for Materials Science and Technology Dübendorf 8600 Switzerland

School of Physics and Optoelectronics South China University of Technology Guangzhou Guangdong 510641 China

Funding

Fundamental Research Funds for the Central Universities · National Outstanding Youth Science Fund Project of National Natural Science Foundation of China

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