This standard is part of the performance test methods within the series of standards for phosphors, specifying in detail the determination methods for key performance characteristics of various phosphors used in electric light sources, displays, and specialized lighting applications. These methods cover optical performance parameters such as luminance or luminous efficiency, emission spectrum, chromaticity coordinates, color temperature, and color rendering index, as well as tests for physicochemical properties including average particle size, particle size distribution, density, and thermal stability. The standard involves the use of key testing instruments such as phosphor luminance measurement devices, luminance meters, standard lamps, spectroradiometers, spectrophotometers, particle size analyzers, and densitometers. This standard provides a comprehensive basis for performance evaluation in the production, research, development, and application of phosphors.