Nanocrystal light-emitting diodes based on type II nanoplatelets

Date
2018
Advisor
Instructor
Source Title
Nano Energy
Print ISSN
2211-2855
Electronic ISSN
2211-3282
Publisher
Elsevier BV
Volume
47
Issue
Pages
115 - 122
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Abstract

Colloidal semiconductor nanoplatelets (NPLs) have recently emerged as a new family of semiconductor nanocrystals with distinctive structural and electronic properties originating from their atomically flat architecture. To date, type II NPLs have been demonstrated to possess great potential to optoelectronic applications, such as solar cells and lasers. Herein, nanocrystal light-emitting diodes (LEDs) based on type II NPLs have been developed. The photoluminescence quantum yield of these used type II NPL (CdSe/CdSe0.8Te0.2 core/crown) is close to 85%. By exploring an effective inverted structure with the dual hole transport layer, the NPL-LEDs exhibit i) a turn-on voltage of 1.9 V, ii) a maximum luminance of 34520 cd m−2, iii) an EQE of 3.57% and a PE of 9.44 lm W−1. Compared with previous NPL-based LEDs, the performance of our devices is remarkably enhanced. For example, the luminance is 350-fold higher than the best inverted NPL-based LED. The findings may not only represent a significant step for NPL-based LEDs, but also unlock a new opportunity that this class of type II NPLs materials are promising for developing high-performance LEDs.

Course
Other identifiers
Book Title
Keywords
Nanocrystal, Nanoplatelet, Light-emitting diode, Type II, Efficiency
Citation
Published Version (Please cite this version)