P-type ternary sulfide Cu2SnS3 and CuCo2S4 with merits of low toxicity, natural abundance and intrinsic low lattice thermal conductivity are considered as promising eco-friendly thermoelectric materials. Here, we report a...
Fabrication of highly
efficient all thermally activated delayed
fluorescence (TADF) white organic light-emitting diodes (WOLEDs) through
solution-process still remains a big challenge. Here, two encapsulated
TADF molecules with a small singlet–triplet energy gap (ΔE
ST) and high photoluminescence quantum yield
(PLQY) were designed and synthesized as yellow emitters for solution-processed
WOLEDs. The high current, power, and external quantum efficiencies
of 41.6 cd A–1, 30.4 lm W–1, and
17.3% were achieved for the solution-processed all-fluorescence WOLEDs
with a single-emission layer. In contrast, even with the same ΔE
ST and PLQY, the corresponding unencapsulated
parent emitters will account for nearly 50% loss of the potential
device efficiency. This is for the first time that the small molecular
TADF blue host and TADF yellow guest are used to construct solution-processed
all-fluorescence WOLEDs, which exhibit high efficiency comparable
with most of the vacuum-deposited all-fluorescence white devices.
These results not only demonstrate the great potential of TADF emitters
in achieving highly efficient solution-processed WOLEDs, but also
testify the key role of molecular encapsulation in reducing polar-exciton
quenching and enhancing electroluminescence performance.
2021): Enhanced thermoelectric performance in polymorphic heavily Co-doped Cu 2 SnS 3 through carrier compensation by Sb substitution, Science and Technology of Advanced Materials,
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