標題: Incorporating a hole-transport material into the emissive layer of solid-state light-emitting electrochemical cells to improve device performance
作者: Huang, Po-Chin
Krucaite, Gintare
Su, Hai-Ching
Grigalevicius, Saulius
照明與能源光電研究所
Institute of Lighting and Energy Photonics
公開日期: 1-一月-2015
摘要: Solid-state light-emitting electrochemical cells (LECs) based on ionic transition metal complexes (iTMCs) have several advantages such as high efficiency, low operation voltage and simple device structure. To improve the device efficiency of iTMC-based LECs for practical applications, improving the carrier balance to achieve a centered recombination zone would be an important issue. In this work, incorporating a hole-transport material (HTM) into the emissive layer of iTMC-based LECs is shown to improve device performance. When mixed with an HTM (12%), the LECs based on a Ru complex exhibit 1.9x and 1.5x enhancement in peak light output and peak external quantum efficiency (EQE) as compared to neat-film devices. Furthermore, over 2x enhancement in stabilized EQE can be achieved in LECs mixed with an HTM. It is attributed to that a more centered recombination zone in LECs mixed with an HTM is beneficial in reducing exciton quenching in the recombination zone approaching extended doped layers. Estimating the temporal evolution of the recombination zone in the LECs mixed with an HTM by employing the microcavity effect is demonstrated to confirm the physical origin for improved device performance. These results reveal that incorporating of an HTM in the emissive layer of LECs based on an iTMC is a feasible way to improve carrier balance and thus enhance light output and device efficiency.
URI: http://dx.doi.org/10.1039/c5cp02034d
http://hdl.handle.net/11536/127951
ISSN: 1463-9076
DOI: 10.1039/c5cp02034d
期刊: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume: 17
Issue: 26
起始頁: 17253
結束頁: 17259
顯示於類別:期刊論文