Lead Sulfide (PbS) Quantum Dots · Lead Sulfide (PbS) Quantum Dots Technical Data Sheet PbS QDs...

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Lead Sulfide (PbS) Quantum Dots

Technical Data Sheet PbS QDs according to the emission peak

QD-LS-900-em Lead sulfide quantum dots (PbS core),

900 nm peak emission, solid or in toluene/octane















PbS QDs according to the absorption peak

QD-LS-800-abs Lead sulfide quantum dots (PbS core),

800 nm excitonic absorption peak, solid or in toluene/octane




















1800 nm excitonic absorption peak, solid or in octane





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QUANTUM SOLUTIONS is an expert in synthesis of PbS Quantum Dots. We produce

high quality quantum dots with precise control of emission and absorption peaks, narrow

fluorescence bands and high quantum yields.

For specific application convenience, two lines of QDs are available:

- With specific emission peaks in the range of 900 – 1600 nm

- With specific first excitonic absorption peaks in the wide range of 800 – 2000 nm

All QDs have narrow FWHM of absorption and emission (even less than 100-120 nm),

have a good crystallinity with high peak-to-valley ratios.

Application fields

PbS Quantum Dots (Lead Sulfide) absorb the light through all visible and near-infrared

(NIR) range and re-emit in NIR range from 800 to 2000 nm depending on nanoparticle sizes from

2.5 to 9 nm respectively. PbS quantum dots are suitable for the use as light absorber or NIR emitter

in such applications as solar cells, photodetectors and infrared LEDs.

Features

PbS QDs with different absorption profiles (that is characterized with the first excitonic

peak absorption from 800 to 2000 nm) and emission peaks (from 900 to 1600 nm)

Narrow absorption and emission fluorescence bands (FWHM) due to narrow particle size

distributions that results in higher devices performance (in solar cells, sensors, LEDs).

High crystallinity with high peak-to-valley ratios

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Specification of PbS QDs according to the emission peak

Catalog Number

QD-LS-900-em

QD-LS-1000-em

QD-LS-1100-em

QD-LS-1200-em

QD-LS-1300-em

QD-LS-1400-em

QD-LS-1500-em

QD-LS-1600-em

Emission peak OD1 in toluene

900 ± 25 nm

1000 ± 25 nm

1100 ± 25 nm

1200 ± 25 nm

1300 ± 25 nm

1400 ± 25 nm

1500 ± 25 nm

1600 ± 25 nm

FWHM* of emission OD 1

≤ 130 nm

≤ 130 nm

≤ 130 nm

≤ 130 nm

≤ 140 nm

≤ 140 nm

≤ 140 nm

≤ 140 nm

PLQY** > 40-60 %

Stock shift ~ 140

nm ~ 120

nm ~ 110

nm ~ 100

nm ~ 80 nm ~ 70 nm ~ 60 nm ~ 45 nm

Average PbS core size

~2.7 nm ~3.0 nm ~3.3 nm ~3.8 nm ~4.5 nm ~5 nm ~5.5 nm ~6 nm

Capping ligand

Oleic acid

Appearance Black solid/paste Black solid/powder

Solvent available

Toluene, Octane

*FWHM – Full Width at Half Maximum, **PLQY – Photo Luminescence Quantum Yield

Emission spectra

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Specification of PbS QDs according to the first excitonic

absorption peak

Catalog Number

QD-LS-800-abs

QD-LS-900-abs

QD-LS-1000-abs

QD-LS-1100-abs

QD-LS-1200-abs

QD-LS-1300-abs

QD-LS-1400-abs

QD-LS-1500-abs

QD-LS-1600-abs

QD-LS-1700-abs

QD-LS-1800-abs

QD-LS-1900-abs

QD-LS-2000-abs

Absorption peak OD1 in

toluene

800 ± 15 nm

900 ± 15 nm

1000 ± 15 nm

1100 ± 15 nm

1200 ± 15 nm

1300 ± 15 nm

1400 ± 15 nm

1500 ± 15 nm

1600 ± 20 nm

1700 ± 25 nm

1800 ± 25 nm

1900 ± 25 nm

2000 ± 30 nm

FWHM of absorption

OD1

≤ 120 nm

≤ 120 nm

≤ 120 nm

≤ 120 nm

≤ 120 nm

≤ 120 nm

≤ 120 nm

≤ 140 nm

≤ 150 nm

≤ 190 nm

≤ 200 nm

≤ 220 nm

Peak-to-valley ratio

≥ 1.2 ≥ 1.5 ≥ 2 ≥ 3 ≥ 4 ≥ 5 ≥ 5 ≥ 6 ≥ 6 ≥ 5 ≥ 3 ≥ 2.5 ≥ 2

Stock shift ~ 140

nm ~ 120

nm ~ 110

nm ~ 100

nm ~ 90 nm

~ 80 nm

~ 70 nm

~ 50 nm

N/A N/A N/A N/A N/A

Average PbS core size

~2.9 nm

~3.2 nm

~3.5 nm

~4 nm ~4.5 nm

~5 nm ~5.5 nm

~6 nm ~6.5 nm

~7 nm ~8 nm ~8.5 nm

~9 nm

Capping ligand

Oleic acid

Appearance Black solid/paste Black solid/powder

Solvent available

Toluene, octane Octane

Absorption spectra

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TEM images

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Customized products

PbS Quantum Dots with different solvents, concentrations, emission and absorption peaks are

available upon request.

Notes for handling

Shelf Life 12 months. Shipping temperature 4-25 °C. Store temperature 4-25 °C. Store in DARK,

in original packaging or in airtight sealed packaging inside glovebox (under inert atmosphere).

Repackage or dissolve in a glovebox only. Use anhydrous solvents only. Avoid a contact with air.

PbS QDs solids are easily soluble in octane or any other non-polar solvents (hexane, toluene,

chloroform, chlorobenzene, dichlorobenzene) in a wide range of concentrations up to 100-150

mg/mL. After QDs mixing with the solvents, please leave it overnight before processing. Dissolve

in a glove box only. Use anhydrous solvents only. Avoid sonication. Filter the solution by PTFE

filters before processing.

If you use PbS QDs for thin film devices (photodetectors, solar cell, LEDs) and perform solution

ligand exchange, use QDs as it is for ligand exchange. If you provide solid ligand exchange, we

recommend to wash PbS QDs by methanol (or ethanol, or isopropanol) 1-2 times before processing.

Instruction for washing will be provided with the order upon request.

Packing

Glass vials of 10-30 ml.

QUANTUM SOLUTIONS Addr: King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia Web: www.quantum-solutions.com E-mail: [email protected]

Tel.: +966 56 302 3423

http://www.quantum-solutions.com/

mailto:[email protected]

Lead Sulfide (PbS) Quantum Dots · Lead Sulfide (PbS) Quantum Dots Technical Data Sheet PbS QDs...

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