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High‐Efficiency and Stable ZnSeTe‐Based Blue QLEDs Enabled by Freeze‐Dried SnO2 Nanoparticle Interlayers

Year: 2025

Type: article

Abstract: Quantum dot light‐emitting diodes (QLEDs) have emerged as a promising next‐generation technology for display and lighting applications due to their outstanding color performance. However, despite considerable progress, blue QLEDs, especially those based on nonheavy metal materials, continue to face significant challenges in efficiency and stability, falling behind their red and green counterparts. Herein, a new strategy is presented to enhance the performance of ZnSeTe‐based blue QLEDs by introducing SnO2 nanoparticles (NPs) prepared via freeze‐drying technology as a conductive interlayer between the quantum dot (QD) layer and ZnO electron transport layer (ETL). This approach improves the dispersion of SnO2 NPs, reduces film surface roughness, and effectively suppresses device leakage currents. Furthermore, the freeze‐drying process minimizes oxygen vacancies in SnO2 and reduces exciton quenching at the QD/ETL interface. As a result, the ZnSeTe‐based blue QLEDs utilizing the freeze‐dried SnO2 NP interlayer achieve a maximum external quantum efficiency (EQE) of 20.8%, a peak brightness of 6017 cd m−2, and a T50 operational lifetime of 130.7 h at a brightness of 100 cd m−2. These findings represent a significant improvement in the efficiency and stability of environmentally friendly blue QLEDs and provide valuable insights for advancing QLED technology.

Source: Laser & Photonics Review

DOI: 10.1002/lpor.202500049