Ultrapure and highly efficient green light emitting devices based on ligand-modified CsPbBr3 quantum dots

Dongdong Yan; Shuangyi Zhao; Huaxin Wang; Zhigang Zang

doi:10.1364/PRJ.391703

Journals >Photonics Research >Volume 8 >Issue 7 >Page 1086 > Article

Photonics Research
Vol. 8, Issue 7, 1086 (2020)

Ultrapure and highly efficient green light emitting devices based on ligand-modified CsPbBr₃ quantum dots | EIC Choice Award

Dongdong Yan, Shuangyi Zhao, Huaxin Wang, and Zhigang Zang^*

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Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China

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DOI: 10.1364/PRJ.391703 Cite this Article Set citation alerts

Dongdong Yan, Shuangyi Zhao, Huaxin Wang, Zhigang Zang. Ultrapure and highly efficient green light emitting devices based on ligand-modified CsPbBr₃ quantum dots[J]. Photonics Research, 2020, 8(7): 1086 Copy Citation Text

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(a) Schematic illustration of the surface in the CsPbBr3 QDs with ligand modification process, (b) XRD patterns, (c) FTIR spectra, and (d) HRTEM images for CsPbBr3 QDs.

Fig. 1. (a) Schematic illustration of the surface in the CsPbBr3 QDs with ligand modification process, (b) XRD patterns, (c) FTIR spectra, and (d) HRTEM images for CsPbBr3 QDs.

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(a) PL spectra, (b) absorption spectra, and (c) lifetime of the CsPbBr3 QDs films. (d) XPS survey spectra of CsPbBr3 QDs. (e) Cs-3d spectrum, (f) Pb-4f spectrum, and (g) Br-3d spectrum. All peaks were calibrated using C 1s (284.8 eV).

Fig. 2. (a) PL spectra, (b) absorption spectra, and (c) lifetime of the CsPbBr3 QDs films. (d) XPS survey spectra of CsPbBr3 QDs. (e) Cs-3d spectrum, (f) Pb-4f spectrum, and (g) Br-3d spectrum. All peaks were calibrated using C 1s (284.8 eV).

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Fig. 3. AFM images of the (a) CsPbBr3-OA and (b) CsPbBr3-DA QDs films.

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Fig. 4. (a) and (b) Evolution of CsPbBr3 QDs coated on LED chips. The optical properties of (c)–(e) CsPbBr3-OA QDs and (f)–(h) CsPbBr3-DA QDs coated on LED chips. (c) and (f) Emission spectra, (d) and (g) green light purity analyses, and (e) and (h) behaviors of chromaticity coordinates with the addition of QDs solution.

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Fig. 5. Optical properties of QDs coated on blue LEDs. (a) and (d) Spectrum intensity, (b) and (e) FWHM, and (c) and (f) behaviors of chromaticity coordinates under different injection currents.

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