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. 2016 May 10;28(9):2902-2906.
doi: 10.1021/acs.chemmater.6b00954. Epub 2016 Apr 19.

Polymer-Free Films of Inorganic Halide Perovskite Nanocrystals as UV-to-White Color-Conversion Layers in LEDs

Francisco Palazon  1 , Francesco Di Stasio  1 , Quinten A Akkerman  1 , Roman Krahne  1 , Mirko Prato  1 , Liberato Manna  1
Affiliations

Polymer-Free Films of Inorganic Halide Perovskite Nanocrystals as UV-to-White Color-Conversion Layers in LEDs

Francisco Palazon et al. Chem Mater. .
No abstract available

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
TEM images of different perovskite nanocrystals. Scale bars are 100 nm.
Figure 2
Figure 2
PL spectra of 4 different perovskite nanocrystals solutions (a) as well as different mixtures of Br-NPL and Br-NC (b) and I-NS and I-NC (c). Corresponding CIE coordinates (d).
Figure 3
Figure 3
(a) Sketch of the preparation of an all perovskite white-emitting bilayer. (1) Deposition of CsPbBr3 NPL and NC; (2) X-ray irradiation to inhibit further anion-exchange; (3) deposition of a second layer of CsPbI3 NS and (4) final X-ray irradiation preventing degradation of CsPbI3 nanocrystals under illumination. Final bilayer system, illuminated with a 365 nm UV LED emits at different emission wavelengths corresponding to perovskite nanocrystals excited by direct illumination or by Förster transfer. (b) CIE coordinates and (c) efficiency curves of perovskite bilayer films with (stabilized) and without (not stabilized) a final X-ray irradiation step. Both samples were irradiated between the first and second deposition to avoid anion-exchange.
Figure 4
Figure 4
PL spectra (a, c) and corresponding CIE coordinates (b) of different solutions of Br-NPL and Br-NC mixed with CISZ (a) and CdSe/CdS (b) nanocrystals. In the CIE diagram, pure composition solutions are marked with a star, dots correspond to CdSe/CdS-based mixtures and triangles to CIZS-based mixtures. Spectra in (a,c) correspond to rounded markers of same color in panel b. (d) Efficiency of white LED consisting of a commercial UV LED with thin films of mixed perovskite/CIZS and perovskite/GS as color-conversion layers.
See this image and copyright information in PMC

References

    1. McKittrick J.; Shea-Rohwer L. E.; Green D. J. Review: Down Conversion Materials for Solid-State Lighting. J. Am. Ceram. Soc. 2014, 97 (5), 1327–1352. 10.1111/jace.12943. - DOI
    1. Schubert F. E.; Kim J. K. Solid-State Light Sources Getting Smart. Science 2005, 308, 1274–1278. 10.1126/science.1108712. - DOI - PubMed
    1. Jang E.; Jun S.; Jang H.; Lim J.; Kim B.; Kim Y. White-light-emitting diodes with quantum dot color converters for display backlights. Adv. Mater. 2010, 22 (28), 3076–3080. 10.1002/adma.201000525. - DOI - PubMed
    1. Brovelli S.; Guan H.; Winroth G.; Fenwick O.; Di Stasio F.; Daik R.; Feast W. J.; Meinardi F.; Cacialli F. White luminescence from single-layer devices of nonresonant polymer blends. Appl. Phys. Lett. 2010, 96 (21), 213301.10.1063/1.3387816. - DOI
    1. Brovelli S.; Sforazzini G.; Serri M.; Winroth G.; Suzuki K.; Meinardi F.; Anderson H. L.; Cacialli F. Emission Color Trajectory and White Electroluminescence Through Supramolecular Control of Energy Transfer and Exciplex Formation in Binary Blends of Conjugated Polyrotaxanes. Adv. Funct. Mater. 2012, 22 (20), 4284–4291. 10.1002/adfm.201200786. - DOI