Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 35, Pages 39720-39729Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c07547
Keywords
quasi-two-dimensional perovskite; perovskite nanocrystals; film morphology; light-emitting diodes; solution processing
Funding
- National Key Research and Development Program of China [2017YFB0404501]
- National Foundation for Science and Technology Development of China (973 project) [2015CB932203]
- National Major Fundamental Research Program of China [91833306]
- National Natural Science Foundation of China [61505086, 61705111, 61704091]
- Science Fund for Distinguished Young Scholars of Jiangsu Province of China [BK20160039]
- Natural Science Foundation of Jiangsu Province [BM2012010, BK20170899]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [YX030003]
- Jiangsu National Synergetic Innovation Center for Advanced Materials
- Synergetic Innovation Center for Organic Electronics and Information Displays
- National Postdoctoral Program for Innovative Talents [BX201700122]
- Open Foundation from Jilin University [IOSKL2017KF04, IOSKL2018KF01]
Ask authors/readers for more resources
Solution-processed quasi-two-dimensional (Q-2D)/colloidal perovskite nanocrystals (PNCs) perovskite composite films are first prepared as the emitting layers of perovskite light-emitting diodes (PeLEDs). The subsequent multi-spin-coating of PNCs not only fills the gully-like fluctuations of the nanocrystal pinning-prepared Q-2D perovskite films and decreases their surface roughness but also transforms the bilayer perovskite nanosheets into multilayer ones, thus improving the charge transport and reducing the hole-injection barrier in the composite films. More importantly, the bromide vacancies and Pb defects in the Q-2D perovskites are removed via Br- supply and Pb-OOC-R interaction, in which the Br ions and COO- groups (from oleic acid) come from the PNC solution, and the radiation recombination is significantly enhanced. Based on the Q-2D/PNCs perovskite composite emitter, the PeLEDs achieve a maximum luminescence of similar to 2.0 x 10(4) cd/m(2) and a peak current efficiency of 27.5 cd/A, showing 175 and 337% enhancements compared to the control device with the pristine Q-2D perovskite emitter. The lifetime for the luminance decaying to 50% of the initial intensity increases by a factor of 13.8, demonstrating that the device stability is also improved by the Q-2D/PNCs perovskite composite film.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available