4.6 Article

In Situ Synthesis of UltraStable TiO2 Coating Rb+-Doped Red Emitting CsPbBrI2 Perovskite Quantum Dots

Journal

JOURNAL OF PHYSICAL CHEMISTRY C
Volume 126, Issue 3, Pages 1542-1551

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c09945

Keywords

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Funding

  1. National Natural Science Foundation of China (NSFC) [52161145103, 61774124, 61604122]
  2. National Key R&D Program of China [2019YFB1503200]
  3. China Postdoctoral Science Foundation [2020T130500, 2019M660253]
  4. 111 Program [B14040]
  5. Natural Science Basic Research Program of Shannxi [2019JLP-18]
  6. Science and Technology on High Power Microwave Laboratory Fund [6142605190202]

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In this study, it was found that the luminescent properties of CsPbBrI2 PQDs can be significantly improved through doping of univalent RV ions, especially when the molar ratio of Rb+/Cs+ is 0.1/0.9. Furthermore, the addition of a TiO2 nanoshell can greatly enhance the stability of these PQDs, allowing them to maintain their excellent red emitting characteristics even when immersed in water or exposed to illumination.
Among the lead halide perovskites, the stability of red-emitting CsPbBrI2 perovskite quantum dots (PQDs) is very poor. This is an impediment to the development of high purity white emitting diodes (WLEDs) based on PQDs. Herein, we surprisingly find that luminescent properties of CsPbBrI2 PQDs can be significantly improved through doping of univalent RV ions, especially when molar ratio of Rb+/Cs+ = 0.1/0.9. Subsequently, these red emitting Rb0.1Cs0.9PbBrI2 PQDs are successfully coated with TiO2 through an easy in situ strategy of adding titanium(IV) butoxide (TBO) to the precursor. Benefiting from the efficient protection of TiO2 nanoshell, these highly fluorescent Rb0.1Cs0.9PbBrI2/TiO2 nanocomposites can preserve their excellent red emitting characteristics even when directly immersed in water or exposed to illumination, enabling us to build highly stable WLEDs with color coordinates at 0.342, 0.325).

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