Abstract
We report high-efficiency quantum dot light-emitting diodes (QLEDs) with Li-doped TiO2 nanoparticles (NPs) as an alternative electron transport layer (ETL). Colloidally stable TiO2 NPs are applied as ETLs of inverted structured QLEDs and the effect of the addition of lithium (Li) to TiO2 NPs on device characteristics is studied in detail. Compared to pristine TiO2 NPs, Li-doped ones are found to be beneficial for the charge balance in the emitting layer of QLEDs mainly by means of their upshifted conduction band minimum, which in turn limits electron injection. A green QLED with 5% Li-doped TiO2 NPs produces a maximum luminance of 169 790 cd m-2, an EQE of 10.27%, and a current efficiency of 40.97 cd A-1, which indicate the best device performances to date among QLEDs with non-ZnO inorganic ETLs. These results indicate that Li-doped TiO2 NPs show great promise for use as a solution-based inorganic ETL for future QLEDs.
| Original language | English |
|---|---|
| Pages (from-to) | 2838-2842 |
| Number of pages | 5 |
| Journal | Nanoscale |
| Volume | 13 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2021 Feb 7 |
Bibliographical note
Funding Information:This research was financially supported by the Korea Institute for Advancement of Technology through the International Cooperative R&D program (P0011268). This work was also supported by the Materials Innovation Project (2020M3H4A3082656) funded by the National Research Foundation of Korea and the Technology Innovation Program (20010737) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).
Publisher Copyright:
© The Royal Society of Chemistry.
All Science Journal Classification (ASJC) codes
- Materials Science(all)