Ultrafast Saturable Absorption of Core/Shell Colloidal Quantum Dots

2016 ◽  
Vol 34 (1) ◽  
pp. 1600193 ◽  
Author(s):  
Jingzhou Li ◽  
Saifeng Zhang ◽  
Hongxing Dong ◽  
Yunfei Ma ◽  
Bin Xu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Colloidal Quantum Dots ◽  
Saturable Absorption ◽  
Core Shell

scholarly journals Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns Pulses

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1366
Author(s):  
Rashid A. Ganeev ◽  
Andrey I. Zvyagin ◽  
Ivan A. Shuklov ◽  
Maksim G. Spirin ◽  
Oleg V. Ovchinnikov ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nonlinear Refraction ◽  
Colloidal Quantum Dots ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Core Shell ◽  
Nonlinear Scattering ◽  
532 Nm

InP@ZnS core-shell colloidal quantum dots (CQDs) were synthesized and characterized using the z-scan technique. The nonlinear refraction and nonlinear absorption coefficients (γ = −2 × 10−12 cm2 W−1, β = 4 × 10−8 cm W−1) of these CQDs were determined using 10 ns, 532 nm pulses. The saturable absorption (β = −1.4 × 10−9 cm W−1, Isat = 3.7 × 108 W cm−2) in the 3.5 nm CQDs dominated at small intensities of the probe pulses (I ≤ 7 × 107 W cm−2) followed by reverse saturable absorption at higher laser intensities. We report the optical limiting studies using these CQDs showing the suppression of propagated nanosecond radiation in the intensity range of 8 × 107–2 × 109 W cm−2. The role of nonlinear scattering is considered using off-axis z-scan scheme, which demonstrated the insignificant role of this process along the whole range of used intensities of 532 nm pulses. We discuss the thermal nature of the negative nonlinear refraction in the studied species.

Surface Organic Ligands-Passivated Quantum Dots: Toward High-Performance Light-Emitting Diodes with Long Lifetime

2021 ◽  
Author(s):  
Lishuang Wang ◽  
Ying Lv ◽  
Jie Lin ◽  
Jialong Zhao ◽  
Xingyuan Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Organic Ligands ◽  
Colloidal Quantum Dots ◽  
Core Shell ◽  
Light Emitting ◽  
Long Lifetime

For quantum dots light-emitting diodes (QLEDs), typical colloidal quantum dots (QDs) are usually composed of a core/shell heterostructure which is covered with organic ligands as surface passivated materials to confine...

Spin-Cast Deposition of CdSe-CdS Core-Shell Colloidal Quantum Dots on Doped GaAs Substrates: Structural and Optical Characterization

2007 ◽  
Vol 6 (4) ◽  
pp. 413-420 ◽  
Author(s):  
Adrienne D. Stiff-Roberts ◽  
Wanming Zhang ◽  
Jian Xu ◽  
Hongying Peng ◽  
Henry O. Everitt
Keyword(s):  
Quantum Dots ◽  
Optical Characterization ◽  
Colloidal Quantum Dots ◽  
Core Shell ◽  
Gaas Substrates

Small-Sized PbSe/PbS Core/Shell Colloidal Quantum Dots

2012 ◽  
Vol 24 (22) ◽  
pp. 4417-4423 ◽  
Author(s):  
Diana Yanover ◽  
Richard K. Čapek ◽  
Anna Rubin-Brusilovski ◽  
Roman Vaxenburg ◽  
Nathan Grumbach ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Colloidal Quantum Dots ◽  
Core Shell

scholarly journals CdSe/ZnS Colloidal Quantum Dots with Alloyed Core/Shell Interfaces: A Photoluminescence Dynamics Study

2011 ◽  
Vol 120 (5) ◽  
pp. 870-873 ◽  
Author(s):  
K. Dziatkowski ◽  
D. Ratchford ◽  
T. Hartsfield ◽  
X. Li ◽  
Y. Gao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Colloidal Quantum Dots ◽  
Core Shell
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