Hi,

In Blue emitting phosphor, you must spend a higher energy LED so that the Stoke Shift can take place such as UV LEDs. Then, the final spectrum has a small amount of the spectrum of UV-LED and a big amount of the emission spectrum (Phosphor). If the conversion is full, the small amout is 0. 

Finally, in any case you have no white spectrum, but a color spectrum. For the color spectrum, there is NO concept of CRI. CRI is the metric to evaluate the color differences between 14 TCSs under a standard light source and your test light source. These light sources must be white according to CIE standard.

So, now your question is only, how to know coordinate values x and y? At the best way, you should measure your spectrum and herewith you can calculate x,y based on the cmf (CIE color matching function x(lamda), y(lamda), z(lamda)). If you can not measure the spectrum, simply you can find the peak wavelength or dominate wavelength of the emisison spectrum and in the CIE color diagram you can determine the x,y relatively. Or you can spend CIE color diagram and determine roughly the values of x,y in the blue area. Naturally, it is not absolutely correct. 

Please, read the links for more information,

http://www.brucelindbloom.com/index.html?WorkingSpaceInfo.html

https://en.wikipedia.org/wiki/Color_rendering_index

https://en.wikipedia.org/wiki/CIE_1931_color_space

Or you can spend a color meter like under,

https://www.gigahertz-optik.de/en-us/product/HCT-99D

http://www.technoteam.de/product_overview/lmk/products/lmk_5/index_eng.html

http://sensing.konicaminolta.asia/products/cs-2000-spectroradiometer/

I hope that It can help you partly! Thanks and best regards,

V T

Vinh Quang Trinh@ thank you very much sir, its really been very helpful.

Hi,

You can use LED meter to calculate the color coordinates of your luminescent material. LED meter is a device which can be used to calculate the color coordinates, CRI and color temperature of luminescent materials or LEDs.