Cesium Lead Halide Perovskite Nanocrystals Assembled in Metal–Organic Frameworks for Stable Blue Light Emitting Diodes

Tsai, Hsinhan; Huang, Hsin‐Hsiang; Watt, John; Hou, Cheng‐Hung; Strzalka, Joseph; Shyue, Jing‐Jong; Wang, Leeyih; Nie, Wanyi

doi:10.1002/advs.202105850

Cesium Lead Halide Perovskite Nanocrystals Assembled in Metal–Organic Frameworks for Stable Blue Light Emitting Diodes

Journal Article · Tue Mar 15 00:00:00 EDT 2022 · Advanced Science

DOI:https://doi.org/10.1002/advs.202105850· OSTI ID:1869208

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Berkeley, CA (United States)
National Taiwan Univ., Taipei (Taiwan)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Academia Sinica, Taipei (Taiwan)
Argonne National Lab. (ANL), Argonne, IL (United States)

All inorganic cesium lead trihalide nanocrystals are promising light emitters for bright light emitting diodes (LEDs). Here we demonstrate CsPb(BrCl)_1.5 nanocrystals in metal-organic frameworks (MOF) thin films to achieve bright and stable blue LEDs. The lead metal nodes in the MOF thin film react with Cs-halide salts, resulting in 10~20 nm nanocrystals. This is revealed by X-ray scattering and transmission electron microscopy. Employing the CsPbX₃- MOF thin films as emission layers, bright deep blue and sky-blue LEDs are demonstrated that emit at 452 nm and 476 nm respectively. The maximum external quantum efficiencies of these devices are 0.72% for deep blue LEDs and 5.6% for sky blue LEDs. More importantly, the device can maintain 50% of its original electroluminescence (T₅₀) for 2.23 hours when driving at 4.2V. Detailed optical spectroscopy and time-of-flight secondary ion mass spectroscopy suggest that the ion migration can be suppressed that maintains the emission brightness and spectra. Our study provides a new route for fabricating stable blue light emitting diodes with all-inorganic perovskite nanocrystals.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: Academia Sinica, Taiwan; Ministry of Science and Technology (MOST), Taiwan; National Taiwan University; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Laboratory Directed Research and Development (LDRD) Program. Los Alamos National Laboratory (LANL); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: 89233218CNA000001; AC02-06CH11357

OSTI ID:: 1869208

Alternate ID(s):: OSTI ID: 1874197

Report Number(s):: LA-UR-21-30401; 173699

Journal Information:: Advanced Science, Journal Name: Advanced Science Journal Issue: 14 Vol. 9; ISSN 2198-3844

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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