+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Single-mode lasing from colloidal water-soluble CdSe/CdS quantum dot-in-rods

Single-mode lasing from colloidal water-soluble CdSe/CdS quantum dot-in-rods

Small 11(11): 1328-1334

Core-shell CdSe/CdS nanocrystals are a very promising material for light emitting applications. Their solution-phase synthesis is based on surface-stabilizing ligands that make them soluble in organic solvents, like toluene or chloroform. However, solubility of these materials in water provides many advantages, such as additional process routes and easier handling. So far, solubilization of CdSe/CdS nanocrystals in water that avoids detrimental effects on the luminescent properties poses a major challenge. This work demonstrates how core-shell CdSe/CdS quantum dot-in-rods can be transferred into water using a ligand exchange method employing mercaptopropionic acid (MPA). Key to maintaining the light-emitting properties is an enlarged CdS rod diameter, which prevents potential surface defects formed during the ligand exchange from affecting the photophysics of the dot-in-rods. Films made from water-soluble dot-in-rods show amplified spontaneous emission (ASE) with a similar threshold (130 μJ/cm(2)) as the pristine material (115 μJ/cm(2)). To demonstrate feasibility for lasing applications, self-assembled microlasers are fabricated via the "coffee-ring effect" that display single-mode operation and a very low threshold of ∼10 μJ/cm(2). The performance of these microlasers is enhanced by the small size of MPA ligands, enabling a high packing density of the dot-in-rods.

Please choose payment method:

(PDF emailed within 0-6 h: $19.90)

Accession: 055798042

Download citation: RISBibTeXText

PMID: 25335769

DOI: 10.1002/smll.201402527

Related references

Lasing in self-assembled microcavities of CdSe/CdS core/shell colloidal quantum rods. Nanoscale 2(6): 931-935, 2010

Single-Mode Lasing from "Giant" CdSe/CdS Core-Shell Quantum Dots in Distributed Feedback Structures. Acs Applied Materials and Interfaces 9(15): 13293-13303, 2017

Ultralow-Threshold Single-Mode Lasing from Phase-Pure CdSe/CdS Core/Shell Quantum Dots. Journal of Physical Chemistry Letters 7(24): 4968-4976, 2016

General shape control of colloidal CdS, CdSe, CdTe quantum rods and quantum rod heterostructures. Journal of Physical Chemistry. B 109(18): 8538-8542, 2005

Small-angle rotation in individual colloidal CdSe quantum rods. Acs Nano 2(6): 1179-1188, 2008

Random Lasing with Systematic Threshold Behavior in Films of CdSe/CdS Core/Thick-Shell Colloidal Quantum Dots. Acs Nano 9(10): 9792-9801, 2015

Band Gap Variation of Size- and Shape-Controlled Colloidal CdSe Quantum Rods. Nano Letters 1(7): 349-351, 2001

Nearly temperature-independent threshold for amplified spontaneous emission in colloidal CdSe/CdS quantum dot-in-rods. Advanced Materials 24(35): Op231, 2012

Photoluminescence from single CdSe quantum rods. Journal of Luminescence 97(3-4): 205-211, 2002

Two-photon-induced blue shift of core and shell optical transitions in colloidal CdSe/CdS quasi-type II quantum rods. Acs Nano 7(3): 2443-2452, 2013

Excitation wavelength dependence of the photoluminescence quantum yield and decay behavior of CdSe/CdS quantum dot/quantum rods with different aspect ratios. Physical Chemistry Chemical Physics 19(19): 12509-12516, 2017

Effects of K+ and Na+ ions on the fluorescence of colloidal CdSe/CdS and CdSe/ZnS quantum dots. Sensors and Actuators B: Chemical 155(2): 823-830, 2011

Charging and Discharging Channels in Photoluminescence Intermittency of Single Colloidal CdSe/CdS Core/Shell Quantum Dot. Journal of Physical Chemistry Letters 7(24): 5176-5182, 2016

Influence of surface states on blinking characteristics of single colloidal CdSe-CdS/ZnS core-multishell quantum dot. Journal of Colloid and Interface Science 505: 528-536, 2017

Effect of Photo-and Thermoactivation of CdSe Cores on the Luminescent Properties of CdSe@CdS Colloidal Quantum Dots. High Energy Chemistry 52(2): 131-137, 2018