3D Perovskite Nanocrystal Colloid: Ensemble Photoluminescence

Nanocrystal Batch

Diameter d 6.0 nm

Halide mix (Cl ↔ Br ↔ I) Br

Excitation

405 nm pump flux 70%

Surface traps (ligand loss) 20%

Live Readouts

Bulk gap E_g0

2.30 eV

Confinement ΔE

0.14 eV

Total bandgap

2.44 eV

Emission λ

508 nm

Photons emitted

PLQY

Pump status

absorbing

How it works

Same size + composition tuning as the 2D single-particle view, shown as a real colloidal batch instead: dozens of identical CsPb(Cl/Br/I)₃ nanocrystal cubes are suspended in solution and a 405 nm pump beam sweeps across them. Every crystal shares the same bandgap (set by the sliders), so the whole suspension glows a single emission color — exactly how a real quantum-dot cuvette looks under a UV lamp. Absorption only happens where the pump's 3.06 eV photon energy still clears the bandgap; each excited crystal then either emits a colored photon burst (radiative recombination) or flashes a dull ember (a trapped, non-radiative loss) with a probability set by surface-trap density.

E_g(d,x) = E_bulk(x) + K / d²      (Brus-style confinement, K ≈ 5 eV·nm²)
E_bulk: 3.10 eV (Cl) → 2.30 eV (Br) → 1.73 eV (I)
absorbed ⇔ E_pump(3.06 eV) ≥ E_g
PLQY = radiative / (radiative + trapped)

Diameter — shrinks every cube in the batch and blue-shifts the shared glow color.
Halide mix — anion-exchange composition; re-tints the whole suspension from violet through green to red.
Pump flux — how many 405 nm photons per second sweep the batch.
Surface traps — ligand-passivation quality; more traps means more dull ember flashes and a lower PLQY readout.

Drag to orbit the suspension; scroll to zoom.

405 nm pump electron e⁻ hole h⁺ PL photon

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