Lasing and spectral characteristics of neutral red dye

Pathrose, Bini P.; Prakash, A. P. Gnana; Nampoori, V. P. N.; Radhakrishnan, P.; Sahira, H.; Mujeeb, A.

doi:10.1016/j.ijleo.2017.12.036

Cited by 4 publications

(4 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Laser emission in NR solutions has been partially explored for the development of dye lasers. 45 This in principle represents a good starting point to achieve stimulated emission amplification also in NR-CDs. The possibility to obtain red lasing from the NR-CD sample is tested within a homemade resonant cavity pumped by 5 ns pulses from an external tunable laser (see Figure S14a and Methods).…”

Section: Resultsmentioning

confidence: 95%

“…Such a drawback is particularly detrimental for applications requiring a constant or intense irradiation of the fluorophore, such as when they are used as color-converting layers in light-emitting diodes (LEDs) or as an active medium in the resonant cavity of a dye laser. For instance, NR’s emission intensity has been shown to decrease by 50% in less than 3 h when irradiated by a Nd:YAG laser operating at 532 nm with an energy density of 32 mJ/cm 2 . Considering this aspect, the key role of the CDs’ carbonaceous matrix as a protecting scaffold for the NR fluorophore appears evident: as shown in Figure and Figure S12, under UV irradiation of moderate intensity, NR-CDs display a dramatically enhanced resistance to photobleaching compared to bare NR.…”

Section: Resultsmentioning

confidence: 99%

“…Laser emission in NR solutions has been partially explored for the development of dye lasers . This in principle represents a good starting point to achieve stimulated emission amplification also in NR-CDs.…”

Section: Resultsmentioning

confidence: 99%

“…Uses of NR for optoelectronic applications are less common than those in the biological field, as NR emits only in solution and not from the solid state, unless there are significant modifications to its structure . In addition, while it has previously been applied as an active medium in dye lasers, its usage is not widespread, being considered less efficient with respect to other dyes, albeit both significantly less expensive and harmful. Examples of CD synthesis that use NR as precursor have already been reported in the literature, − however without specifically studying whether and how the optical properties of the obtained nanoparticles are correlated to those of the fluorescent dye.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Dye-Derived Red-Emitting Carbon Dots for Lasing and Solid-State Lighting

Madonia,

Minervini,

Terracina

et al. 2023

ACS Nano

View full text Add to dashboard Cite

Carbon dots are carbon-based nanoparticles renowned for their intense light-emitting capabilities covering the whole visible light range. Achieving carbon dots emitting in the red region with high efficiency is extremely relevant due to their huge potential in biological applications and in optoelectronics. Currently, photoluminescence in such an energy interval is often associated with polyheterocyclic molecular domains forming during the synthesis that, however, present low emission efficiency and issues in controlling the optical features. Here, we overcome these problems by solvothermally synthesizing carbon dots starting from Neutral Red, a common red-emitting dye, as a molecular precursor. As a result of the synthesis, such molecular fluorophore is incorporated into a carbonaceous core while retaining its original optical properties. The obtained nanoparticles are highly luminescent in the red region, with a quantum yield comparable to that of the starting dye. Most importantly, the nanoparticle carbogenic matrix protects the Neutral Red molecules from photobleaching under ultraviolet excitation while preventing aggregation-induced quenching, thus allowing solid-state emission. These advantages have been exploited to develop a fluorescence-based color conversion layer by fabricating polymer-based highly concentrated solid-state carbon dot nanocomposites. Finally, the dye-based carbon dots demonstrate both stable Fabry–Perot lasing and efficient random lasing emission in the red region.

show abstract

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations