Ion dynamics of light-emitting electrochemical cells investigated using operando X-ray spectromicroscopy

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K17926
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Device related chemistry
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: TAKEICHI Yasuo 大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 助教 (40636461)
• Co-Investigator(Renkei-kenkyūsha): ONO Shimpei 電力中央研究所, 材料科学研究所, 主任研究員 (30371298)
• Research Collaborator: MIWA Kazumoto
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: X線顕微分光 / 走査型透過X線顕微鏡 / 電気化学発光セル / オペランド分光

Outline of Final Research Achievements

Light-emitting electrochemical cells (LEC) using ionic liquid are of interest for a new generation light source with high efficiency. We have observed the behavior of the ion distribution in LECs under operation using scanning transmission X-ray microscopy. We found that the operating current actually drives the ion movement, however, observed anion distribution was not fully described by a simple mechanism of self-organized p-n junction. Moreover, heterogeneic ion/polymer distribution due to the phase separation was found in the degraded cells.

Free Research Field

放射光科学