Light Generation in Lead Halide Perovskite Nanocrystals: LEDs, Color Converters, Lasers, and Other Applications

Abstract

Facile solution processing lead halide perovskite nanocrystals (LHP‐NCs) exhibit superior properties in light generation, including a wide color gamut, a high flexibility for tuning emissive wavelengths, a great defect tolerance and resulting high quantum yield; and intriguing electric feature of ambipolar transport with moderate and comparable mobility. As a result, LHP‐NCs have accomplished great achievements in various light generation applications, including color converters for lighting and display, light‐emitting diodes, low threshold lasing, X‐ray scintillators, and single photon emitters. Herein, the considerable progress that has been made thus far is reviewed along with the current challenges and future prospects in the light generation applications of LHP‐NCs.

Two‐Step Anti‐Stokes Photoluminescence of CsPbX3 Nanocrystals

“…These perovskite NCs exhibit high photoluminescence quantum yield (PL QY), tunable and narrow PL, and long carrier diffusion length, making them promising for solar cells, light‐emitting diodes (LEDs), lasers, photocatalyst, etc. [ 1–5 ] These perovskite NCs also exhibit very interesting up‐conversion photoluminescence (UPL) upon single or multiple photon absorption. [ 6,7 ] UPL based on two‐photon absorption (TPA) and three‐photon absorption has been observed from colloidal CsPbBr 3 NCs, and the cross‐section of TPA is found to be ≈1.2 × 10 5 GM, two orders of magnitude larger than conventional II–VI NCs.…”

The dark exciton ground state promotes photon-pair emission in individual perovskite nanocrystals

“…ecent advances in the colloidal synthesis of strongly emitting perovskite nanocrystals (NCs) open up new opportunities for the fabrication of tunable light sources based on the composition and quantum size effect tuning 1 , such as lightemitting diodes and lasers 2 , and for the exploration of their potential use as quantum light sources [3][4][5][6] . The knowledge of the band-edge exciton fine structure in perovskites and the ability to tailor it with NC composition, morphology, or external fields are of prime importance for the development of efficient singlephoton sources or sources of entangled photons for quantum information processes [7][8][9] , and for applications in optoelectronics and spin-based technologies [10][11][12] .…”

Ultrastable Perovskite–Zeolite Composite Enabled by Encapsulation and In Situ Passivation

“…The diversity of perovskite composition makes them band gap tunable, synthesis facile, solution processable, as well as cost less. Of particularly, perovskite nanocrystals (NCs), as an interesting and important class of nanomaterials, exhibit unique properties including high exciton binding energy, optical nonlinearities and high fluorescence quantum yield [11–15] . This potentially provides a platform for exploring new photophysical properties of perovskite quantum wells and possesses outstanding photoluminescence in light emitting devices, stimulated lasing, and single‐dot spectroscopy.…”