Science Advances

Supplementary Materials

This PDF file includes:

  • text S1. Blue DC LEDs.
  • text S2. ASE experiments.
  • fig. S1. Photoluminescence properties of perovskite CQWs in solution.
  • fig. S2. Optical absorption of perovskite CQW samples.
  • fig. S3. Photoluminescence properties of FAPbBr3 CQWs.
  • fig. S4. TRPL analysis of MAPbBr3 perovskite CQWs.
  • fig. S5. Synchrotron GIWAXS pattern of lamellar solid composed of n = 1 MAPbBr3 CQWs.
  • fig. S6. Morphology analysis of perovskite CQWs by means of STEM.
  • fig. S7. SEM analysis of the film morphology.
  • fig. S8. The orientation distribution map of bulk MA cations in n = 3 CQW.
  • fig. S9. Surface MA cation orientation with 75% ligand coverage.
  • fig. S10. Electronic band structures projected on states of Pb atoms (left column), Br atoms (middle column), and CH3NH3 molecules (right column).
  • fig. S11. Charge density difference plots with different configurations.
  • fig. S12. Final geometries after relaxation.
  • fig. S13. CIE chromaticity coordinates of green (n = 7 to 10) and blue (n = 3) CQW solid phosphor-based DC-LEDs.
  • fig. S14. Driving current (I) and luminance (L) as a function of voltage (V).
  • fig. S15. Luminous efficacy as a function of luminance for commercial blue GaN LED as pumping source.
  • fig. S16. Demonstration of blue DC emission using n = 3 MA CQW solid.
  • fig. S17. Operational stability of n = 7 to 10 MA CQW downconverting film.
  • fig. S18. Observation of ASE.
  • fig. S19. The threshold behavior for the intensity of the ASE band.
  • table S1. Ligand volumes.
  • table S2. Absolute ηPL summary.
  • Legends for movies S1 to S3
  • References (65–68)

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Other Supplementary Material for this manuscript includes the following:

  • movie S1 (.mp4 format). Ab initio MD of the n = 1 geometry viewed along the 001 axis.
  • movie S2 (.mp4 format). Ab initio MD of the n = 1 geometry viewed along the 100 axis.
  • movie S3 (.mp4 format). Ab initio MD of the n = 1 geometry viewed along the 010 axis.

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