Low-threshold and narrow-emission random lasing in a self-assembly TiN nanoparticle-doped carbon quantum dot/DCM nanowire composite

Abstract

The random lasing in quantum dot systems is in anticipation for widespread applications in biomedical therapy and image recognition, especially in random laser devices with high brightness and high monochromaticity. Herein, low-threshold, narrowband emission, and stable random lasing is realized in carbon quantum dot (CQD)/DCM nanowire composite-doped TiN nanoparticles, which are fabricated by the mixture of carbon quantum dots and self-assembly DCM dye molecules. The Förster resonance energy transfer process results in a high luminescence efficiency for the composite of carbon dots and DCM nanowires, allowing significant random lasing actions to emerge in CQD/DCM composite as TiN particles are doped that greatly enhance the emission efficiency through the plasmon resonance and random scattering. Thus, sharp and low-threshold random lasing is finally realized and even strong single-mode lasing occurs under higher pumping energy in the TiN-doped CQD/DCM composite. This work provides a promising way in high monochromaticity random laser applications.

Random fiber laser using a cascaded fiber loop mirror

“…Researchers doped dye molecules, 19 ferromagnetic nanoparticles, 20 and scattering nanoparticles 21 into polymer fibers to tune the random lasing behavior. Other works such as self-healing hydrogel fiber based on a metal-organic framework 22 and nanowire composite doped with TiN nanoparticles 23 also provide great tunability to the RFL. But these works could require a relatively complex fabrication process.…”

Statistically Identified Dual Type Random Lasing from Carbon Dots

“…39,40 Thus, only a few works have provided clear-cut evidence of paradigmatic mirror-free RL emission from a mixture of CDs and metal or semiconductor scatterers. 41,42 Other works have rather demonstrated hybrid designs, where RL is observed from CDs hosted inside a microresonator under certain experimental conditions, 43 or scatterers 38 are utilized to reduce CD lasing threshold within a Fabry−Perot cavity. While lasing from CDs housed inside a square cuvette easily leads to directional laser beams, 44,45 it is often unclear if this emission can be classified as Fabry−Perot lasing off cuvette walls, which can provide remarkably strong feedback even without external mirrors, or rather RL enabled by scattering from CDs themselves.…”

“…In the last two decades, carbon dots (CDs) have been emerging as a candidate nanomaterial for bioimaging and optoelectronic applications because of their bright tunable fluorescence. , Broadly speaking, CDs can be seen as a carbon-based equivalent of quantum dots (QDs), endowed with specific advantages due to their water solubility, ease of functionalization, and lack of rare or critical chemical elements. , CDs have been applied in light-emitting devices ranging from electroluminescent white-light emitting diodes − to more exotic latent fingerprint detection devices . In regard to lasers, although CD optical gain coefficients are generally smaller , than luminescent dyes, QDs, and perovskites, − CDs have been successfully used as gain media in traditional laser cavities. , However, CD-based random lasers remain challenging, since CDs are usually quenched by semiconductor or metal nanoscatterers. , Thus, only a few works have provided clear-cut evidence of paradigmatic mirror-free RL emission from a mixture of CDs and metal or semiconductor scatterers. , Other works have rather demonstrated hybrid designs, where RL is observed from CDs hosted inside a microresonator under certain experimental conditions, or scatterers are utilized to reduce CD lasing threshold within a Fabry–Perot cavity. While lasing from CDs housed inside a square cuvette easily leads to directional laser beams, , it is often unclear if this emission can be classified as Fabry–Perot lasing off cuvette walls, which can provide remarkably strong feedback even without external mirrors, or rather RL enabled by scattering from CDs themselves.…”

Tunable Narrowband Carbon Quantum Dots Laser Based on Self‐Assembled Microstructure

“…[ 14 ] Notably, due to their intriguing photophysical properties, low dark toxicity, tuneable surface functionality, and adaptable synthesis, CQDs have been harnessed as a gain medium in lasers [ 15 ] and successful achievement of multi‐wavelength lasers has been demonstrated through surface modification of CQDs. [ 16 ] Researchers have explored various methods, such as planar waveguides, [ 17 ] microcavities, [ 18 ] and nanowires [ 19 ] to enhance the luminescence efficiency of CQDs lasers and improve the efficiency of laser generation. However, the realization of CQDs as a gain medium in photonic cavity lasers remains to be accomplished.…”