ISO DIS 20351

Description / Abstract: This standard covers a method of absolute measurement (using an integrating sphere) of internal quantum efficiency of phosphor powders which are excited by UV or blue light and emit visible light and which are used for white light emitting diode (LED)s.

This standard may be adopted for the measurement of phosphors used in non-white LEDs, for example, green, orange, pink or purple light emitting LEDs.