high color purity
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2022 ◽  
Vol 429 ◽  
pp. 132464
Author(s):  
Sun-Hyoung Lee ◽  
Seung-Won Song ◽  
Suk-Young Yoon ◽  
Dae-Yeon Jo ◽  
Sun-Kyo Kim ◽  
...  

2022 ◽  
Vol 20 (2) ◽  
pp. 021601
Author(s):  
Jintong Liu ◽  
Kun Feng ◽  
Yusi Wang ◽  
Qingyuan Li ◽  
Nan Chen ◽  
...  

RSC Advances ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 810-821
Author(s):  
Yuichi Kitagawa ◽  
Makoto Tsurui ◽  
Yasuchika Hasegawa

In this review, we summarize the research progress on π-conjugated Eu(iii) luminophores exhibiting bright emission and their physical sensing applications.


2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Qing Zhang ◽  
Ruoyu Wang ◽  
Bowen Feng ◽  
Xiaoxia Zhong ◽  
Kostya Ostrikov

AbstractDue to complex structure and surface functionalities, photoluminescence mechanisms of Carbon Dots are unknown, and it is challenging to synthesize Carbon Dots to achieve the desired optical properties. Herein, Carbon Dots simultaneously exhibiting high-color-purity (FWHM~24 nm) long wavelength one-photon fluorescence emission at 620 nm and NIR induced two-photon fluorescence emission at 630 and 680 nm are prepared by edge amino protonation treatment. Systematic analysis reveals that the protonation of 2,3-diaminophenazine changes the molecular state of Carbon Dots, decreases the photon transition band gap, and triggers red fluorescence emission with the dramatically narrowed peak width. As the oxidation products of reactant o-phenylendiamine, the emergence of 2,3-diaminophenazine as a photoluminescence determiner suggests that fluorophore products of precursor conversion are viable determinants of the desired luminescence properties of Carbon Dots. This work shows a new way for predicting and controlling photoluminescence properties of Carbon Dots, and may guide the development of tunable Carbon Dots for a broad range of applications.


2021 ◽  
Vol 12 (1) ◽  
Author(s):  
A. Lennart Schleper ◽  
Kenichi Goushi ◽  
Christoph Bannwarth ◽  
Bastian Haehnle ◽  
Philipp J. Welscher ◽  
...  

AbstractFast emission and high color purity are essential characteristics of modern opto-electronic devices, such as organic light emitting diodes (OLEDs). These properties are currently not met by the latest generation of thermally activated delayed fluorescence (TADF) emitters. Here, we present an approach, called “hot exciplexes” that enables access to both attributes at the same time. Hot exciplexes are produced by coupling facing donor and acceptor moieties to an anthracene bridge, yielding an exciplex with large T1 to T2 spacing. The hot exciplex model is investigated using optical spectroscopy and quantum chemical simulations. Reverse intersystem crossing is found to occur preferentially from the T3 to the S1 state within only a few nanoseconds. Application and practicality of the model are shown by fabrication of organic light-emitting diodes with up to 32 % hot exciplex contribution and low efficiency roll-off.


2021 ◽  
Author(s):  
K. Ganesh Kumar ◽  
P. Balaji Bhargav ◽  
K. Aravinth ◽  
Raja Arumugam ◽  
P. Ramasamy ◽  
...  

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