Incorporation of rubidium cations into blue perovskite quantum dot light-emitting diodes via FABr-modified multi-cation hot-injection method
- 18 December 2018
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Nanoscale
- Vol. 11 (3), 1295-1303
- https://doi.org/10.1039/c8nr07907b
Abstract
Solution-processed lead halide perovskite quantum dots (QDs) are emerging as one of the most promising candidates for emissive display application. Although perovskite QDs with a full spectrum of visible light emissions have been realized for years, realizing the efficient electroluminescence of blue perovskites at room temperature still faces severe challenges. Herein, we demonstrate both the efficient photoluminescence and electroluminescence of the blue perovskite QDs via a simple FABr-modified multi-cation hot-injection (FMMHI) method. The FMMHI method is unique in both the addition of FABr into the PbBr2 precursor solution and the incorporation of small rubidium (Rb+) into the blue perovskite QDs light-emitting diodes (QLEDs). The addition of FABr into the precursor solution can realize strong quantum confinement effect, large exciton binding energy and high-quality perovskite QD films. Besides, the bandgap can be enlarged by the Rb+-induced perovskite octahedral distortion and strong quantum confinement effect. Excellent PLQYs of 64.5% and 49.8% were achieved for the developed greenish-blue QDs (Rb0.33Cs0.67)0.42FA0.58PbBr3 and deep-blue QDs (Rb0.33Cs0.67)0.42FA0.58PbCl1.25Br1.75 in solid film state. Moreover, maximum external quantum efficiencies (EQEs) of 3.6% and 0.61% were also achieved with an electroluminescence peak wavelength at 502 and 466 nm, respectively, indicating that the perovskite QDs incorporated with Rb+ possess great potential for the development of high-performance blue perovskite electroluminescence diodes.Keywords
Funding Information
- National Natural Science Foundation of China (51573059, 91733302, 51625301, 51603071)
- Guangdong Science and Technology Department (2016B090906003, 2016TX03C175)
- China Scholarship Council (201806155054)
This publication has 50 references indexed in Scilit:
- Bright Light‐Emitting Diodes Based on Organometal Halide Perovskite NanoplateletsAdvanced Materials, 2015
- Blue-Green Color Tunable Solution Processable Organolead Chloride–Bromide Mixed Halide Perovskites for Optoelectronic ApplicationsNano Letters, 2015
- Band Gap Tuning of CH3NH3Pb(Br1–xClx)3 Hybrid Perovskite for Blue ElectroluminescenceACS Applied Materials & Interfaces, 2015
- Brightly Luminescent and Color-Tunable Colloidal CH3NH3PbX3 (X = Br, I, Cl) Quantum Dots: Potential Alternatives for Display TechnologyACS Nano, 2015
- Efficient Light-Emitting Diodes Based on Nanocrystalline Perovskite in a Dielectric Polymer MatrixNano Letters, 2015
- Bright light-emitting diodes based on organometal halide perovskiteNature Nanotechnology, 2014
- The emergence of perovskite solar cellsNature Photonics, 2014
- Cation-Induced Band-Gap Tuning in Organohalide Perovskites: Interplay of Spin–Orbit Coupling and Octahedra TiltingNano Letters, 2014
- High Photoluminescence Efficiency and Optically Pumped Lasing in Solution-Processed Mixed Halide Perovskite SemiconductorsThe Journal of Physical Chemistry Letters, 2014
- Hitching a ride with motor proteinsNature Nanotechnology, 2014