Blue Liquid Lasers from Solution of CdZnS/ZnS Ternary Alloy Quantum Dots with Quasi‐Continuous Pumping

Abstract

A blue (ca. 440 nm) liquid laser with an ultra-low threshold through which quasi-continuous wave pumping is accessible is achieved by engineering unconventional ternary CdZnS/ZnS alloyed-core/shell QDs. Such an achievement is enabled by exploiting the novel gain media with minimal defects, suppressed Auger recombination, and large gain cross-section in combination with high-quality-factor whispering gallery mode resonators.

Active photonic devices based on colloidal semiconductor nanocrystals and organometallic halide perovskites

“…A first strategy consisted of filling the core of an optical fiber with a 30001-p12 I. Suárez Alvarez: Active photonic devices based on colloidal semiconductor nanocrystals and organometallic halide perovskites colloidal solution of CdZnS/ZnS QDs (emission at 440 nm) [72]. Whispering gallery modes of the cover provided the required feedback to demonstrate 5 nm narrow laser lines with a threshold of 14.7 mJ/cm 2 under nanosecond excitation.…”

Colloidal nanocrystals for quality lighting and displays: milestones and recent developments

“…Later, this group employed these QDs on distributed feedback gratings to achieve lasing [104,105] with power conversion efficiencies reaching 28% for the red lasers [105]. An interesting study on the lasing of QD solution was reported by Wang et al [106] In this work, blue-emitting CdZnS/ZnS ternary alloyed QDs were synthesized to obtain high-efficiency emitters with suppressed Auger recombination. These QDs were later incorporated into hollow fused silica fibers, in which whispering gallery modes provided the feedback mechanism required for lasing.…”

The Energy Levels Splitting Calculated for the Heavy and Light Holes in a Cd<sub>1-x</sub>Zn<sub>x</sub>S Double Quantum Dot

“…We can evoke red-light-emitting diodes (LEDs) fabricated using CdSe/ Cd 1-x Zn x S quantum dots (QDs) [21], blue (∼440 nm) liquid laser with an ultra-low threshold achieved by engineering unconventional ternary CdZnS/ZnS alloyed-core/shell QDs [22] and fluorescent CdS QDs utilized for the direct detection of fusion proteins [23]. Furthermore, Cd 1-x Zn x S QDs have become one of the most promising materials in solar cell area [24].…”

“…Concerning Cd 1−x Zn x S quantum dots (QDs), their considerable advantage has been demonstrated in both fundamental and applied research [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”