Lee Seyoung, Kim Jimyoung, Lee Honyeon
Department of Electronic Materials, Devices and Equipment Engineering, Soonchunhyang University, Asan 31538, Republic of Korea.
Nanomaterials (Basel). 2023 May 31;13(11):1780. doi: 10.3390/nano13111780.
The purpose of this study was to investigate the effect of substrate characteristics on the performance of quantum-dot light-emitting diodes (QLEDs) with the aim of developing high-performance flexible QLEDs. Specifically, we compared QLEDs made with a flexible polyethylene naphthalate (PEN) substrate to those made with a rigid glass substrate, using the same materials and structure except for the substrates. Our findings indicate that the PEN QLED had a 3.3 nm wider full width at half maximum and a 6 nm redshifted spectrum in comparison to the glass QLED. Additionally, the PEN QLED exhibited a 6% higher current efficiency, a flatter current efficiency curve, and a 2.25-V lower turn-on voltage, indicating superior overall characteristics. We attribute the spectral difference to the optical properties of the PEN substrate, such as light transmittance and refractive index. Our study also revealed that the electro-optical properties of the QLEDs were consistent with the electron-only device and transient electroluminescence results, which suggests that the improved charge injection properties of the PEN QLED were responsible. Overall, our study provides valuable insights into the relationship between substrate characteristics and QLED performance, which can be used to develop high-performance QLEDs.
本研究的目的是研究衬底特性对量子点发光二极管（QLED）性能的影响，旨在开发高性能的柔性QLED。具体而言，我们将采用柔性聚萘二甲酸乙二醇酯（PEN）衬底制成的QLED与采用刚性玻璃衬底制成的QLED进行了比较，除衬底外，使用相同的材料和结构。我们的研究结果表明，与玻璃QLED相比，PEN QLED的半高宽宽3.3 nm，光谱红移6 nm。此外，PEN QLED的电流效率高6%，电流效率曲线更平坦，开启电压低2.25 V，表明其整体特性更优越。我们将光谱差异归因于PEN衬底的光学特性，如透光率和折射率。我们的研究还表明，QLED的电光特性与仅电子器件和瞬态电致发光结果一致，这表明PEN QLED电荷注入特性的改善是原因所在。总体而言，我们的研究为衬底特性与QLED性能之间的关系提供了有价值的见解，可用于开发高性能QLED。
