单层有机发光二极管与无陷主机击败了多层设备的功率效率和寿命
Oskar Sachnik1, Yutaka Ie2, Naoki Ando2
1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
Advanced materials (Deerfield Beach, Fla.)
|January 12, 2024
概括
单层有机发光二极管 (OLED) 通过使用新型主体材料实现高效率和功率. 这一突破提高了运行稳定性,并降低了OLED设备的能源消耗.
科学领域:
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
- 光物理学的光学物理学
背景情况:
- 多层有机发光二极管 (OLED) 是标准的,但复杂的.
- 单层OLED提供了潜在的好处,如降低成本和更简单的制造.
- 在单层OLED中实现高效率需要平衡的电荷传输,这对许多发射者来说是一个挑战.
研究的目的:
- 使用热激活延迟光 (TADF) 发射器开发高效的单层OLED.
- 为了克服单层OLED中的电荷捕获限制.
- 为了提高OLED设备的功率效率和运行稳定性.
主要方法:
- 使用一种新的,没有陷的,大带间隙材料作为DMAC-BP TADF发射器的主体.
- 制造和特征化的一层OLED设备.
- 测量了外部量子效率 (EQE) 和功率效率.
主要成果:
- 在单层OLED设备中实现了几乎平衡的电荷传输.
- 达到19.6%的外部量子效率 (EQE),相当于多层设备.
- 在DMAC-BP OLED中实现了82 lm W-1的创纪录功率效率,超过了多层设备.
- 与多层设备相比,显著提高了运行稳定性.
结论:
- 采用量身定制的主机材料的单层OLED可以与多层设备的性能竞争.
- 开发的方法为更具成本效益,能源效率和稳定的OLED显示器提供了一条途径.
- 这项工作克服了TADF发射器在单层架构中的局限性,为先进的有机电子铺平了道路.
相关概念视频
01:11P-N junction
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
01:16Biasing of P-N Junction
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...