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Special Issue Editors

Prof. Dr. Baohua Zhang

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Guest Editor

Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, Guangzhou Key Laboratory of Sensing Materials & Devices, Guangzhou University, Guangzhou, China
Interests: electrochemiluminescence; electrogenerated chemiluminescence; sensing; biosensing; thermally activated delayed fluorescence

Prof. Dr. Li Niu

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Guest Editor

1. School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China
2. School of Chemical Engineering and Technology, Sun Yat-sen University, Guangzhou 510276, China
Interests: electrochemical sensors and materials; wearable devices
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Special Issue Information

Dear Colleagues,

Electrochemiluminescence (ECL) is persistently considered as a hot research topic and has a wide application scope, e.g., nucleic acid detection, immunoassay and the determination of electrocatalytic activity. Very recent breakthrough work even launched single-molecular scale imaging in cells and tissues (e.g. Nature 2021, 596, 244, cover paper), which further enlarges the application field of ECL. Meanwhile, the basic theoretical research related to ECL has been developing in recent years, such as i) how to more accurately evaluate the light-emitting efficiencies of ECL luminescent probes; ii) the design and application of new ECL luminophores with special photophysical properties, e.g., aggregation-induced emission (AIE) type emitters and thermally activated delayed fluorescence (TADF) type emitters; and iii) the latest ECL signal acquisition strategy, low overpotential ECL method, signal amplification strategy, high-resolution spatial imaging analysis method, etc. In order to further showcase the latest advances in ECL, we have organized this Special Issue, titled “Recent Chemistry Research on Electrochemiluminescence”, with the purpose to highlight the latest advances from all those topics.

Prof. Dr. Baohua Zhang
Prof. Dr. Li Niu
Guest Editors

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Keywords

electrochemiluminescence
electrogenerated chemiluminescence
electrochemistry
sensing
light-emitting
biosensing
environmental
analytical chemistry

Published Papers (2 papers)

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Research

14 pages, 2562 KiB

Open AccessArticle

Studies on Annihilation and Coreactant Electrochemiluminescence of Thermally Activated Delayed Fluorescent Molecules in Organic Medium

by Ping Huang, Xingzi Zou, Zhiyun Xu, Yanting Lan, Lijuan Chen, Baohua Zhang and Li Niu

Molecules 2022, 27(21), 7457; https://doi.org/10.3390/molecules27217457 - 02 Nov 2022

Cited by 5 | Viewed by 1575

Abstract

Very recently, there is a great research interest in electrochemiluminescence (ECL) featuring thermally activated delayed fluorescence (TADF) properties, i.e., TADF-ECL. It is appealing since the earlier reports in this topic well-confirmed that this strategy has a great potential in achieving all-exciton-harvesting ECL efficiency under electrochemical excitation, which is a breakthrough in the topic of organic ECL. However, organic phase electrochemistry and ECL studies surrounding TADF-ECL are still extremely rare. Especially, the ECL spectra of previous reported TADF emitters are still very different from their PL spectra. In this work, we systematically measure and discuss the liquid electrochemistry and ECL behavior of two typical TADF molecules in organic medium. Most importantly, we verify for the first time that the ECL spectra of them (coreactant ECL mode) are identical to their PL spectra counterparts, which confirms the effectiveness of TADF photophysical properties in the coreactant ECL mode in practice. Full article

(This article belongs to the Special Issue Recent Chemistry Research on Electrochemiluminescence)

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Figure 1

12 pages, 2241 KiB

Open AccessFeature PaperArticle

Highly Efficient Solution-Processed Blue Phosphorescent Organic Light-Emitting Diodes Based on Co-Dopant and Co-Host System

by Jingyu Wang, Jiaxuan Yin, Xiaofang Li, Zhe Wang, Ruixia Wu and Liang Zhou

Molecules 2022, 27(20), 6882; https://doi.org/10.3390/molecules27206882 - 14 Oct 2022

Viewed by 1382

Abstract

The low-lying HOMO level of the blue emitter and the interfacial miscibility of organic materials result in inferior hole injection, and long exciton lifetime leads to triplet-triplet annihilation (TTA) and triplet-polaron annihilation (TPA), so the efficiencies of blue phosphorescent organic light-emitting diodes (PhOLEDs) are still unsatisfactory. Herein, we design co-host and co-dopant structures to improve the efficiency of blue PhOLEDs by means of solution processing. TcTa acts as hole transport ladder due to its high-lying HOMO level, and bipolar mCPPO1 helps to balance carriers’ distribution and weaken TPA. Besides the efficient FIr6, which acts as the dominant blue dopant, FCNIrPic was introduced as the second dopant, whose higher HOMO level accelerates hole injection and high triplet energy facilitates energy transfer. An interesting phenomenon caused by microcavity effect between anode and cathode was observed. With increasing thickness of ETL, peak position of electroluminescence (EL) spectrum red shifts gradually. Once the thickness of ETL exceeded 140 nm, emission peak blue-shifts went back to its original position. Finally, the maximum current efficiency (CE), power efficiency (PE), and external quantum efficiency (EQE) of blue phosphorescent organic light-emitting diode (PhOLED) went up to 20.47 cd/A, 11.96 lm/W, and 11.62%, respectively. Full article

(This article belongs to the Special Issue Recent Chemistry Research on Electrochemiluminescence)

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