The Catalysis Society of Metropolitan New York Annual Spring 2025 Symposium was held March 12 on the Lehigh University campus. This is an annual northeastern spring symposium that focuses on the funda...

Professionals are now taking strategic career breaks for higher education. This trend is supported by the rise of global educational collaborations and flexible programmes. Dr Sabrina Jedlicka of Lehi...

Purple Drop Project Advances DNA Computing for Unmatched Data Density and Durability.

He’d never really considered getting his PhD. Not too long ago, proud Lehigh alumnus Dawson Berger ’22 was loving the variety of his day job with H.T. Lyons, a mechanical contractor based in Allentown...

Professor Dan M. Frangopol, the inaugural Fazlur R. Khan Endowed Chair of Structural Engineering and Architecture, has been elected to the National Academy of Engineering (NAE) for his contributions t...

The development of metamaterials—composite materials that have desirable or unusual properties related to their physical structure—is opening up possibilities for innovation in a wide range of fields....

It was an honor when she first learned that her advisor was nominating her for the Koerner Family Foundation (KFF) Fellows program, but Diana Hammerstone ’20 is a busy fifth-year materials science and...

Quantum dot (QD) light-emitting diodes (QLEDs) are promising candidates for next-generation displays because of their high efficiency, brightness, broad color gamut, and solution-processability. Large-scale solution-processing of electroluminescent QLEDs poses significant challenges, particularly concerning the precise control of the active layer’s thickness and uniformity. These obstacles directly impact charge transport, leading to current leakage and reduced overall efficiency. Blade-coating is a prevalent and scalable solution processing technique known for its speed and minimal waste. Additionally, it allows for continuous “roll-to-roll” processing, making it highly adaptable in various applications. In this study, we demonstrate the precise control of blade speed in the Landau–Levich regime to create a uniform QD emission layer, using a commercial CdSe/ZnS QD as a representative example. QDs assemble into different morphologies on glass and the underlying layers of the QLED device due to variations in interaction energy. The QD film thickness can be modified from monolayer to multilayer by adjusting blade speed, which can be predicted by fitting the Landau–Levich–Derjaguin theory. The optimal speed at 7 mm/s results in a QD film with a surface coverage of around 163% and low roughness (1.57 nm mean square height). The QLED external quantum efficiency (EQE) of approximately 1.5% was achieved using commercially available CdSe/ZnS QDs with low photoluminescence quantum yield (PLQY), and an EQE of around 7% has been obtained using lab-made InP/ZnSe/ZnS QDs having a solution PLQY of 74%. All-blade-coated CdSe-QLEDs are further demonstrated by adopting the optimized speed for the QD layer. This method demonstrates significant potential for developing low-cost, reproducible, and scalable QLED technologies with uniform emission characteristics and low-waste production.

Traditionally, the scheduling and control of large-scale systems, such as power grids, microgrids, and naval shipboard power systems, have been managed independently. Enhanced coordination between the...

Zümbül Atan succeeds Ivo Adan as chair of the OPAC group

System Reliability, Risk, Longevity, Sustainability and Optimal Decision-Making—the latest collaboration by the distinguished structural engineering professor and his former doctoral student, now a pr...

CRISPR is a powerful gene-editing tool that holds enormous potential for treating genetic diseases by allowing scientists to cut, replace, or delete mutations in DNA. It can also modify gene expressio...