There are at least two different methods to determine the fluorescence quantum yield of solids, and neither of them requires a solid-state reference, which is very convenient since solid-state references are difficult to find when it comes to determining fluorescence quantum yields. The first of the methods was described by Mirenda et al. You can find it here:

http://www.ncbi.nlm.nih.gov/pubmed/15875401

To apply this method you'll need an integrating sphere and a set of bandpass optical filters. You'll need to set the filters inside the sphere, which is usually much easier than it sounds. This method will allow you to correct for fluorescence reabsorption and for the distortion of the reflectance that occurs due to the emission of light by the sample (this latter distortion is usually confused with dye aggregation). The second of the methods requires only a steady-state fluorescence spectrometer. It is the method described by Ware. You can find it here:

http://pubs.acs.org/doi/abs/10.1021/j100124a035?journalCode=jpchax&quickLinkVolume=97&quickLinkPage=5995&selectedTab=citation&volume=97

I hope that helps. Cheers.

Well, I have never done a QY calculation for a solid sample myself but, I guess intuitively speaking it should be the same as determining QY for any solution (I mean "relative" QY considering a standard of known QY value).

The only change should be in determing the absorption spectrum where you can measure the diffuse reflectance instead and get the absorption profile using Kubelka-Munk formulation or if your instrument is sophisticated enough it can also do it for you upon press of a button. Do the same for both reference and sample. Fluorescence of solid samples can be measured directly.

My common sense tells me this should work though I'm not 100% confident. Think about it. Good luck !

In principle you should be able to do it in a similar manner as a solution as Rupashree Singh suggested. You may have the issue with the sensitivity of your detector, depending on the instrument you use for the measurement. With a solid sample I would expect that you would only get fluorescence from the surface of the solid, and thus the majority of the sample will not emit, resulting in a very weak signal. If you do get absorption and fluorescence from the interior of the solid, I would expect much of that signal to be scattered, and thus it is likely to not reach the detector. I think you have your best chance at getting a usable signal in you have can use a parabolic mirror to collect the fluorescence and reflect it to your detector.

Yes parabolic mirrors should be the choice. I agree with Albert Dukes suggestions.

There are at least two different methods to determine the fluorescence quantum yield of solids, and neither of them requires a solid-state reference, which is very convenient since solid-state references are difficult to find when it comes to determining fluorescence quantum yields. The first of the methods was described by Mirenda et al. You can find it here:

http://www.ncbi.nlm.nih.gov/pubmed/15875401

To apply this method you'll need an integrating sphere and a set of bandpass optical filters. You'll need to set the filters inside the sphere, which is usually much easier than it sounds. This method will allow you to correct for fluorescence reabsorption and for the distortion of the reflectance that occurs due to the emission of light by the sample (this latter distortion is usually confused with dye aggregation). The second of the methods requires only a steady-state fluorescence spectrometer. It is the method described by Ware. You can find it here:

http://pubs.acs.org/doi/abs/10.1021/j100124a035?journalCode=jpchax&quickLinkVolume=97&quickLinkPage=5995&selectedTab=citation&volume=97

I hope that helps. Cheers.

Thank you Rupashree, Albert, Sergio.....for the suggestion ....

A simple way to measure the PLQY of a film using an integrating sphere and fluorimeter can be found in

https://www.researchgate.net/publication/223174148_Measurements_of_solid-state_photoluminescence_quantum_yields_of_films_using_a_fluorimeter?ev=srch_pub

Article Measurements of Solid-State Photoluminescence Quantum Yields...

In addition to what has been said. There is one more method to measure quantum yield.

Quantum Yield = Kr x Fluorescence lifetime

In this method quantum yield can be obtained simply by measuring the fluorescence lifetime experimentally, provided radiative rate constant is known. Fluorescence lifetime is more easy to measure than measuring quantum yield especially in films or solid samples due to scattering and other losses.

You can also measure the radiative rate constant. Here is a reference for measuring radiative rate constant.

https://www.researchgate.net/publication/255744862_On_the_radiative_lifetime_quantum_yield_and_fluorescence_decay_of_Alq_in_thin_films?ev=srch_pub

Article On the radiative lifetime, quantum yield and fluorescence de...

 I was looking for answers to similar question and it's good that I came across these answers. However, can anyone suggest how to work with metal-organic frameworks (MOF) which are often not soluble in a variety of solvents?

You can use these insoluble MOFS as heterogeneous catalsyt

http://pubs.acs.org/doi/abs/10.1021/acs.chemmater.6b02626?journalCode=cmatex

For the measurements of the PLQY we recorded the required parameters from fluorescent spectroscopy and putted these data to below given calculation table. On just putting your data you can get your results within a sec without any calculation.