DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Probing Linewidths and Biexciton Quantum Yields of Single Cesium Lead Halide Nanocrystals in Solution

Journal Article · · Nano Letters

Cesium lead halide (CsPbX3, X = Cl, Br, I) perovskite nanocrystals (PNCs) have recently become a promising material for optoelectronic applications due to their high emission quantum yields and facile band gap tunability via both halide composition and size. The spectroscopy of single PNCs enhances our understanding of the effect of confinement on excitations in PNCs in the absence of obfuscating ensemble averaging and can also inform synthetic efforts. However, single PNC studies have been hampered by poor PNC photostability under confocal excitation, precluding interrogation of all but the most stable PNCs, and leading to a lack of understanding of PNCs in the regime of high confinement. Here, we report the first comprehensive spectroscopic investigation of single PNC properties using solution-phase photon-correlation methods, including both highly confined and blue-emitting PNCs, previously inaccessible to single NC techniques. With minimally perturbative solution-phase photon-correlation Fourier spectroscopy (s-PCFS), we establish that the ensemble emission linewidth of PNCs of all sizes and compositions is predominantly determined by the intrinsic single PNC linewidth (homogeneous broadening). The single PNC linewidth, in turn, dramatically increases with increasing confinement, consistent with what has been found for II–VI semiconductor nanocrystals. With solution-phase photon antibunching measurements, we survey the biexciton-to-exciton quantum yield ratio (BX/X QY) in the absence of user-selection bias or photodegradation. Remarkably, the BX/X QY ratio depends both on the PNC size and halide composition, with values between ~2% for highly confined bromide PNCs and ~50% for intermediately confined iodide PNCs. Our results suggest a wide range of underlying Auger rates, likely due to transitory charge carrier separation in PNCs with relaxed confinement.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Excitonics (CE)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001088
OSTI ID:
1470544
Journal Information:
Nano Letters, Vol. 17, Issue 11; Related Information: CE partners with Massachusetts Institute of Technology (lead); Brookhaven National Laboratory; Harvard University; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 59 works
Citation information provided by
Web of Science

References (62)

Solution-Phase Synthesis of Cesium Lead Halide Perovskite Nanowires journal July 2015
Nanocrystals of Cesium Lead Halide Perovskites (CsPbX 3 , X = Cl, Br, and I): Novel Optoelectronic Materials Showing Bright Emission with Wide Color Gamut journal February 2015
Dismantling the “Red Wall” of Colloidal Perovskites: Highly Luminescent Formamidinium and Formamidinium–Cesium Lead Iodide Nanocrystals journal March 2017
Controlled Synthesis of Composition Tunable Formamidinium Cesium Double Cation Lead Halide Perovskite Nanowires and Nanosheets with Improved Stability journal February 2017
Nontemplate Synthesis of CH 3 NH 3 PbBr 3 Perovskite Nanoparticles journal January 2014
Quantum Size Effect in Organometal Halide Perovskite Nanoplatelets journal September 2015
Structure-Tuned Lead Halide Perovskite Nanocrystals journal November 2015
Colloidal Organohalide Perovskite Nanoplatelets Exhibiting Quantum Confinement journal May 2015
Synthesis of Cesium Lead Halide Perovskite Nanocrystals in a Droplet-Based Microfluidic Platform: Fast Parametric Space Mapping journal February 2016
Fast Anion-Exchange in Highly Luminescent Nanocrystals of Cesium Lead Halide Perovskites (CsPbX 3 , X = Cl, Br, I) journal July 2015
Tuning the Optical Properties of Cesium Lead Halide Perovskite Nanocrystals by Anion Exchange Reactions journal August 2015
Low-threshold amplified spontaneous emission and lasing from colloidal nanocrystals of caesium lead halide perovskites journal August 2015
Efficient Light-Emitting Diodes Based on Nanocrystalline Perovskite in a Dielectric Polymer Matrix journal March 2015
Band Edge Energies and Excitonic Transition Probabilities of Colloidal CsPbX 3 (X = Cl, Br, I) Perovskite Nanocrystals journal September 2016
Nonlinear Absorption and Low-Threshold Multiphoton Pumped Stimulated Emission from All-Inorganic Perovskite Nanocrystals journal December 2015
Compact high-quality CdSe–CdS core–shell nanocrystals with narrow emission linewidths and suppressed blinking journal February 2013
Colloidal nanoplatelets with two-dimensional electronic structure journal October 2011
Gradient CdSe/CdS Quantum Dots with Room Temperature Biexciton Unity Quantum Yield journal May 2015
Room Temperature Single-Photon Emission from Individual Perovskite Quantum Dots journal September 2015
Single Cesium Lead Halide Perovskite Nanocrystals at Low Temperature: Fast Single-Photon Emission, Reduced Blinking, and Exciton Fine Structure journal January 2016
Slow Auger Recombination of Charged Excitons in Nonblinking Perovskite Nanocrystals without Spectral Diffusion journal September 2016
Superior Optical Properties of Perovskite Nanocrystals as Single Photon Emitters journal October 2015
Colloidal CsPbBr 3 Perovskite Nanocrystals: Luminescence beyond Traditional Quantum Dots journal November 2015
Sample-Averaged Biexciton Quantum Yield Measured by Solution-Phase Photon Correlation journal November 2014
Direct probe of spectral inhomogeneity reveals synthetic tunability of single-nanocrystal spectral linewidths journal June 2013
The Quantum Mechanics of Larger Semiconductor Clusters ("Quantum Dots") journal October 1990
In Situ Transmission Electron Microscopy Study of Electron Beam-Induced Transformations in Colloidal Cesium Lead Halide Perovskite Nanocrystals journal February 2017
Existence of a Size-Dependent Stokes Shift in CsPbBr 3 Perovskite Nanocrystals journal June 2017
Band-edge exciton in quantum dots of semiconductors with a degenerate valence band: Dark and bright exciton states journal August 1996
Size dependence of exciton fine structure in CdSe quantum dots journal June 1996
PbS Nanocrystal Emission Is Governed by Multiple Emissive States journal September 2016
Chemical and Thermodynamic Control of the Surface of Semiconductor Nanocrystals for Designer White Light Emitters journal June 2013
Electron–Phonon Coupling in CdSe/CdS Core/Shell Quantum Dots journal July 2015
Direct Observation of Rapid Discrete Spectral Dynamics in Single Colloidal CdSe-CdS Core-Shell Quantum Dots journal October 2013
Quantum-Confined Stark Effect in Single CdSe Nanocrystallite Quantum Dots journal December 1997
Photon-correlation Fourier spectroscopy journal January 2006
Extracting Spectral Dynamics from Single Chromophores in Solution journal July 2010
Homogeneous Emission Line Broadening in the Organo Lead Halide Perovskite CH 3 NH 3 PbI 3– x Cl x journal March 2014
Charge Carriers in Hybrid Organic–Inorganic Lead Halide Perovskites Might Be Protected as Large Polarons journal November 2015
The Mechanism of Slow Hot-Hole Cooling in Lead-Iodide Perovskite: First-Principles Calculation on Carrier Lifetime from Electron–Phonon Interaction journal April 2015
Evolution of the Single-Nanocrystal Photoluminescence Linewidth with Size and Shell: Implications for Exciton–Phonon Coupling and the Optimization of Spectral Linewidths journal December 2015
The “Surface Optical” Phonon in CdSe Nanocrystals journal March 2014
Size dependent, state-resolved studies of exciton-phonon couplings in strongly confined semiconductor quantum dots journal June 2008
Exciton–LO-phonon couplings in spherical semiconductor microcrystallites journal January 1992
Localized holes and delocalized electrons in photoexcited inorganic perovskites: Watching each atomic actor by picosecond X-ray absorption spectroscopy journal July 2017
Screening in crystalline liquids protects energetic carriers in hybrid perovskites journal September 2016
Spectroscopy of Single CdSe Nanoplatelets journal July 2012
Spectral and Dynamical Properties of Single Excitons, Biexcitons, and Trions in Cesium–Lead-Halide Perovskite Quantum Dots journal March 2016
Delayed Luminescence in Lead Halide Perovskite Nanocrystals journal June 2017
Temporary Charge Carrier Separation Dominates the Photoluminescence Decay Dynamics of Colloidal CdSe Nanoplatelets journal February 2016
Delayed Exciton Emission and Its Relation to Blinking in CdSe Quantum Dots journal October 2015
Charge-Carrier Dynamics in Organic-Inorganic Metal Halide Perovskites journal May 2016
2D Behaviors of Excitons in Cesium Lead Halide Perovskite Nanoplatelets journal February 2017
Determination of the Exciton Binding Energy in CdSe Quantum Dots journal January 2009
Hydrogen-like Wannier–Mott Excitons in Single Crystal of Methylammonium Lead Bromide Perovskite journal May 2016
Biexciton Quantum Yield of Single Semiconductor Nanocrystals from Photon Statistics journal March 2011
Quantization of Multiparticle Auger Rates in Semiconductor Quantum Dots journal February 2000
Scaling of multiexciton lifetimes in semiconductor nanocrystals journal May 2008
Ultrafast Exciton Dynamics in Colloidal CsPbBr 3 Perovskite Nanocrystals: Biexciton Effect and Auger Recombination journal February 2017
Multiexciton Lifetime in All-Inorganic CsPbBr 3 Perovskite Nanocrystals journal January 2017
Complete ultrafast charge carrier dynamics in photo-excited all-inorganic perovskite nanocrystals (CsPbX 3 ) journal January 2017
Effect of Zero- to One-Dimensional Transformation on Multiparticle Auger Recombination in Semiconductor Quantum Rods journal November 2003

Cited By (14)

Stable Blue Luminescent CsPbBr 3 Perovskite Nanocrystals Confined in Mesoporous Thin Films journal June 2018
Controlling Quantum Confinement and Magnetic Doping of Cesium Lead Halide Perovskite Nanocrystals journal November 2018
Genesis, challenges and opportunities for colloidal lead halide perovskite nanocrystals journal February 2018
A general and rapid room-temperature synthesis approach for metal sulphide nanocrystals with tunable properties journal January 2019
Coherent single-photon emission from colloidal lead halide perovskite quantum dots journal February 2019
Superior properties in room-temperature colloidal-dot quantum emitters revealed by ultralow-dark-count detections of temporally-purified single photons journal November 2019
Metal halide perovskite nanocrystals and their applications in optoelectronic devices journal August 2019
Highly efficient and stable blue-emitting CsPbBr 3 @SiO 2 nanospheres through low temperature synthesis for nanoprinting and WLED journal May 2018
Room temperature continuous-wave excited biexciton emission in perovskite nanoplatelets via plasmonic nonlinear fano resonance journal July 2019
Stable Blue Luminescent CsPbBr 3 Perovskite Nanocrystals Confined in Mesoporous Thin Films journal June 2018
Exploration of Near-Infrared-Emissive Colloidal Multinary Lead Halide Perovskite Nanocrystals Using an Automated Microfluidic Platform journal May 2018
Stable Ultraconcentrated and Ultradilute Colloids of CsPbX 3 (X = Cl, Br) Nanocrystals Using Natural Lecithin as a Capping Ligand journal November 2019
Superior properties in room-temperature colloidal-dot quantum emitters revealed by ultralow-dark-count detections of temporally-purified single photons journal November 2019
Metal Halide Perovskite Nanocrystals: Synthesis, Post-Synthesis Modifications and Their Optical Properties text January 2020