| 초록 |
Advances in colloidal quantum dot light-emitting diodes (QD-LEDs) have led to efficiencies and brightness that rival the best organic LEDs. Nearly ideal internal quantum efficiency being achieved leaves light outcoupling as the only remaining means to improve external quantum efficiency (EQE) but that might require radically different device design and reoptimization. The current state-of-the-art QD-LEDs are based on spherical core/shell QDs, and the effects of shape and optical anisotropy remain essentially unexplored. Here, we report a simple means to improve LED performance by using nanorod-based QD structures, the double heterojunction nanorods (DHNRs), in conjunction with enhanced hole injection via the introduction of a hole dopant to the transport layer within a conventional solution processed device structure. Also, we introduce some printing techniques to allow high resolution patterning of QDs with precise control over thickness and tailoring energy band alignment in QD-LEDs. |
