Increasing the Performance and Stability of Red-Light-Emitting Diodes Using Guanidinium Mixed-Cation Perovskite Nanocrystals
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F23%3APU148446" target="_blank" >RIV/00216305:26620/23:PU148446 - isvavai.cz</a>
Alternative codes found
RIV/00216275:25310/23:39920411
Result on the web
<a href="https://pubs.acs.org/doi/10.1021/acs.chemmater.3c00269" target="_blank" >https://pubs.acs.org/doi/10.1021/acs.chemmater.3c00269</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.chemmater.3c00269" target="_blank" >10.1021/acs.chemmater.3c00269</a>
Alternative languages
Result language
angličtina
Original language name
Increasing the Performance and Stability of Red-Light-Emitting Diodes Using Guanidinium Mixed-Cation Perovskite Nanocrystals
Original language description
Halide perovskite nanocrystals (PNCs) exhibit growing attention in optoelectronics due to their fascinating color purity and improved intrinsic properties. However, structural defects emerging in PNCs progressively hinder the radiative recombination and carrier transfer dynamics, limiting the performance of light-emitting devices. In this work, we explored the introduction of guanidinium (GA+) during the synthesis of high-quality Cs(1-x)GA(x)PbI(3) PNCs as a promising approach for the fabrication of efficient bright-red light-emitting diodes (R-LEDs). The substitution of Cs by 10 mol % GA allows the preparation of mixed-cation PNCs with PLQY up to 100% and long-term stability for 180 days, stored under air atmosphere and refrigerated condition (4 degrees C). Here, GA(+) cations fill/replace Cs+ positions into the PNCs, compensating intrinsic defect sites and suppressing the non-radiative recombination pathway. LEDs fabricated with this optimum material show an external quantum efficiency (EQE) near to 19%, at an operational voltage of 5 V (50-100 cd/m(2)) and an operational half-time (t(50)) increased 67% respect CsPbI3 R-LEDs. Our findings show the possibility to compensate the deficiency through A-site cation addition during the material synthesis, obtaining less defective PNCs for efficient and stable optoelectronic devices.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Chemistry of Materials
ISSN
0897-4756
e-ISSN
1520-5002
Volume of the periodical
35
Issue of the periodical within the volume
10
Country of publishing house
US - UNITED STATES
Number of pages
9
Pages from-to
3998-4006
UT code for WoS article
000995938300001
EID of the result in the Scopus database
2-s2.0-85160760687