Detailed Information

Cited 0 time in webofscience Cited 184 time in scopus
Metadata Downloads

Highly Efficient Light-Emitting Diodes of Colloidal Metal-Halide Perovskite Nanocrystals beyond Quantum Size

Authors
Kim, Young-HoonWof, ChristophKim, Young-TaeCho, HimchanKwon, WoosungDo, SunganSadhanala, AdityaPark, Chan GyungRhee, Shi-WooIm, Sang HyukFriend, Richard H.Leet, Tae-Woo
Issue Date
Jul-2017
Publisher
AMER CHEMICAL SOC
Keywords
perovskite nanocrystal; quantum size; light-emitting diodes; hole injection layer; electroluminescence
Citation
ACS NANO, v.11, no.7, pp 6586 - 6593
Pages
8
Journal Title
ACS NANO
Volume
11
Number
7
Start Page
6586
End Page
6593
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/8242
DOI
10.1021/acsnano.6b07617
ISSN
1936-0851
1936-086X
Abstract
Colloidal metal-halide perovskite quantum dots (QDs) with a dimension less than the exciton Bohr diameter D-B (quantum size regime) emerged as promising light emitters due to their spectrally narrow light, facile color tuning, and high photoluminescence quantum efficiency (PLQE). However, their size-sensitive emission wavelength and color purity and low electroluminescence efficiency are still challenging aspects. Here, we demonstrate highly efficient light-emitting diodes (LEDs) based on the colloidal perovskite nano crystals (NCs) in a dimension > D-B (regime beyond quantum size) by using a multifunctional buffer hole injection layer (Buf-HIL). The perovskite NCs with a dimension greater than D-B show a size-irrespective high color purity and PLQE by managing the recombination of excitons occurring at surface traps and inside the NCs. The Buf-HIL composed of poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS) and per fluorinated ionomer induces uniform perovskite particle films with complete film coverage and prevents exciton quenching at the PEDOT:PSS/perovskite particle film interface. With these strategies, we achieved a very high PLQE (similar to 60.5%) in compact perovskite particle films without any complex post-treatments and multilayers and a high current efficiency of 15.5 cd/A in the LEDs of colloidal perovskite NCs, even in a simplified structure, which is the highest efficiency to date in green LEDs that use colloidal organic-inorganic metal-halide perovskite nanoparticles including perovskite QDs and NCs. These results can help to guide development of various light-emitting optoelectronic applications based on perovskite NCs.
Files in This Item
Go to Link
Appears in
Collections
공과대학 > 화공생명공학부 > 1. Journal Articles

qrcode

Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher Kwon, Woosung photo

Kwon, Woosung
공과대학 (화공생명공학부)
Read more

Altmetrics

Total Views & Downloads

BROWSE