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eLibrary > BS ISO 20351:2024 Fine ceramics (advanced ceramics, advanced technical ceramics). Test method for optical properties of ceramic phosphors for white light-emitting diodes using an integrating sphere >

BS ISO 20351:2024 Fine ceramics (advanced ceramics, advanced technical ceramics). Test method for optical properties of ceramic phosphors for white light-emitting diodes using an integrating sphere, 2024

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BS ISO 20351:2024 Fine ceramics (advanced ceramics, advanced technical ceramics). Test method for optical properties of ceramic phosphors for white light-emitting diodes using an integrating sphere, 2024

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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement apparatus [Go to Page]
4.1 Apparatus configuration
4.2 Light source unit
4.3 Sample unit [Go to Page]
4.3.1 Cell
4.3.2 White diffuser or reference cell
4.3.3 Integrating sphere
4.4 Detection unit [Go to Page]
4.4.1 Directing optical system
4.4.2 Spectrometer and detector
4.4.3 Amplifier
4.5 Signal and data processing unit
5 Calibration, inspection and maintenance of measurement apparatus [Go to Page]
5.1 General
5.2 Wavelength calibration of light source unit
5.3 Cells and cover glasses
5.4 Integrating sphere walls and white diffusers
5.5 Wavelength calibration of detection unit
5.6 Spectral responsivity correction
6 Samples [Go to Page]
6.1 Reference material
6.2 Storage and pre-processing
6.3 Filling cells with samples
7 Procedure, calculation and report for absolute measurement [Go to Page]
7.1 Measurement method [Go to Page]
7.1.1 Measurement environment
7.1.2 Light spectrum without phosphor sample
7.1.3 Light spectrum with phosphor sample
7.2 Calculations [Go to Page]
7.2.1 Conversion to photon-number-based spectra
7.2.2 Fluorescence spectrum
7.2.3 Internal quantum efficiency
7.3 Test report
8 Procedure, calculation and report for substitution measurement [Go to Page]
8.1 Measurement procedures [Go to Page]
8.1.1 Measurement environment
8.1.2 Spectrometer setup for substitution measurement
8.1.3 Measurement for reference material
8.1.4 Measurement for phosphor material under test
8.2 Calculation [Go to Page]
8.2.1 Spectral responsivity correction
8.2.2 Conversion to photon number-based spectral distribution
8.2.3 Calculation of scattered light and fluorescence photon numbers
8.2.4 External quantum efficiency
8.2.5 Absorptance
8.3 Test report
Bibliography [Go to Page]

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BS ISO 20351:2024 Fine ceramics (advanced ceramics, advanced technical ceramics). Test method for optical properties of ceramic phosphors for white light-emitting diodes using an integrating sphere, 2024

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