InGaN blue LED is coated by a thin layer comprising one or more wavelength down-converting phosphors. Their purpose is to absorb blue photons and to re-emit them at longer wavelength by Stockes shift in order to produce composite white light achieving virtually any color temperature and color rendering quality
John D. Bullough
If I understand your question correctly then one possibility may be the scattered photon extraction technique developed by my colleagues at the Lighting Research Center. For more information, see: https://www.lrc.rpi.edu/programs/solidstate/cr_spe.asp
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