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Updated: Feb 4, 2026

Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes
Published on: November 15, 2016
Secondary inner filter effect allows extremely efficient pure white light emission by spatially separated organic
Himanshu Aggarwal1, Rajesh Kumar, Aasheesh Srivastava
1Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal - 462066, Madhya Pradesh, India. Asri@iiserb.ac.in.
Abstract:
Efficient white light emission (WLE) using a combination of organic fluorophores requires careful modulation of their distance and orientation. We exploited the secondary inner filter effect (sIFE) between a multi-responsive 2-(1-pyrenyl)benzimidazole (PyBIM) and perylene-monoimide (PMI) secondary emitter to obtain pure WLE (CIE coordinates 0.33, 0.33) with an unsurpassed efficiency of 70 ± 3% under ambient conditions in highly diluted conditions. The sIFE based approach allows extremely efficient WLE using simple fluorophores that are spatially separated.
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