Observation of optical gain in solutions of CdS quantum dots at room temperature in the blue region

被引：21

作者：

Darugar, Qusai ^{[1
]}

Qian, Wei ^{[1
]}

El-Sayed, Mostafa A. ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Chem & Biochem, Laser Dynam Lab, Atlanta, GA 30332 USA

来源：

APPLIED PHYSICS LETTERS | 2006年 / 88卷 / 26期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.2217138

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The optical gain dynamics has been studied for two CdS quantum dot samples dispersed in toluene at room temperature. This was carried out by using femtosecond transient absorption technique with an excitation at 400 nm and gain measurement was studied at the fluorescence maxima (440 and 460 nm). The optical gain lifetime was found to be as long as 20 ps under pump fluence as low as 0.77 mJ/cm(2). The low threshold is the result of long lifetime of electrons and holes and narrow emission bandwidth. These results suggest that CdS quantum dots in solution are excellent gain media for optically pumped high power blue lasers.

引用

页数：3

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