Chemical Forums

Specialty Chemistry Forums => Materials and Nanochemistry forum => Topic started by: richie on March 23, 2014, 05:04:48 PM

Title: luminescence,phosphor,nanomaterial,borate
Post by: richie on March 23, 2014, 05:04:48 PM: Why REBO3 is called as rare earth “orthoborate” and not as simply as rare earth “borate”? What is the reason behind this?
Title: spectroscopy,luminescence,phosphor
Post by: richie on March 23, 2014, 05:05:58 PM: How to find out what is the most appropriate wavelength to be used as the excitation wavelength for a nanophosphor? How to choose the excitation wavelength? Should I do the uv vis spectroscopy to find out the absorbance and then select the excitation wavelength based on the wavelength corresponding to the highest intensity peak on the absorbance vs wavelength graph?
Title: chromaticity diagram,phosphor
Post by: richie on March 23, 2014, 05:07:40 PM: How can the chromaticity diagram be drawn for a nanophosphor? What is the software called? Can it be downloaded from any site?
Title: Re: spectroscopy,luminescence,phosphor
Post by: Arkcon on March 23, 2014, 06:30:31 PM: Quote from: richie on March 23, 2014, 05:05:58 PM
How to find out what is the most appropriate wavelength to be used as the excitation wavelength for a nanophosphor? How to choose the excitation wavelength? Should I do the uv vis spectroscopy to find out the absorbance and then select the excitation wavelength based on the wavelength corresponding to the highest intensity peak on the absorbance vs wavelength graph?

That's a perfectly good way to do it. if you have a scanning fluorimeter, and a UV spec, you can start that way. When determining the emission spectrum, be certain that you're not finding the Raleigh scattering, or the Raman scattering, or simply the fluorimeter's light scattering.

http://en.wikipedia.org/wiki/Raman_scattering#Raman_scattering
http://en.wikipedia.org/wiki/Rayleigh_scattering#From_molecules
Title: Re: luminescence,phosphor,nanomaterial,borate
Post by: Enthalpy on March 23, 2014, 07:16:41 PM: Nanomaterials influence the wavelength of the emitted light, and if fine enough, of the absorbed light. So documenting the particle size is essential.