Interest in Quantum-dots?

[VDX]

Hi there,

I'm actually busy making different types of "Quantum-dots" in my basement - have actually some from pure materials: iron, carbon, silica ... and in different solvents: oi, Octadecene.

All of them emit yellow green, or green-blue oder even "white" light, when exitated with 405nm UV ... ordered some 365nm-flashlamps, so maybe even better images soon.

Attached is a sample with carbon quantum-dots in octadecene (blue-green for the eye).

Maybe some ideas for active laser development with UV-pumping the solvent to get it lasering in the selected (or adjustable) wavelength?
AFAIk Carbon-nanodots can change the emitted wavelength simply by adjusting the pumping energy/fluence ...

Viktor

[mixedgas]

Would you like a nice ~0.5% transmission 60 cm radius OC for the blue green yellow?

Steve

[VDX]

... we're actually searching for the best way to separate the fractions for size (wavelength) -- so any specific wavelength could be interesting.

Interesting too in the "old" dye laser setups ... too, specific for any of the selected wavelengths ...

[Lumia]

I don't post much, but have done some research on a bit of this, and knew a top researcher at CREOL (Center for Research in Electro Optics) at UCF years ago, Dr. Wu (see: https://creol.ucf.edu/person/shin-tson-wu/). His work was fundamental to nearly all LCD types today, and was helping efforts for QDs for years. I got to see his work (I lived in Orlando and visited the center at least a few times a year)

• For separation I would use electrophoresis or cross-flow electrophoresis (basically flow thru either on and / or off axis) with pick-offs for the "binning" - think of it like a liquid Mass Spectrometer.
• Favorite dye laser configuration (that I have built experimented the most) would be a grazing incidence type (uses a selected order from a blazed grating - thus you can select your spectral width) and wavelength tuning is accomplished via grating rotation. NOTE: a Ring Dye Laser too, but with an integrated grating or better yet probably a prism. Linearizing the tuning wavelengths requires rotating the grating prism at the square root of the desired output wavelength nm = Sq-Rt(angle) IIR...

I / We experimented with dye lasers in a slightly different configuration at AVI (Audio Visual Imagineering) in the mid 80's. Allowed adding another color to basic high powered Ar+ lasers, yellow was fairly easy, red was more difficult and problematic. At ODU (Old Dominion University) I was the lead research / lab tech at Research East Physics Department for about 5 years and developed system designs and opto mechanical structures (plus way more) for a wide array of research laser systems that were mostly used for Atomic Spectroscopy for several NASA and NSF grants.