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See Chinese contents: GB/T 39492-2020 GB/T 39492-2020: Testing method of quantum efficiency for white LED phosphor
This Standard specifies the method principles, instruments and devices, test procedures, test result expression, precision and test report requirements for the quantum efficiency of phosphors used for white LEDs. This Standard is applicable to the testing of the external quantum efficiency and internal quantum efficiency of white LED phosphor emitting in the band range of 400 nm ~ 780 nm when the LED chip is excited with a peak wavelength of 400 nm ~ 480 nm. The determination range of external quantum efficiency is 0.6 ~ 0.9, and the determination range of internal quantum efficiency is greater than 0.9.
