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BS ISO 23946:2020

BS ISO 23946:2020

$142.49

Fine ceramics (advanced ceramics, advanced technical ceramics). Test methods for optical properties of ceramic phosphors for white light-emitting diodes using a gonio-spectrofluorometer

Published By Publication Date Number of Pages
BSI 2020 30
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This document specifies a method for use of a gonio-spectrofluorometer to measure internal quantum efficiency, external quantum efficiency, absorptance, luminescent radiance factor and relative fluorescence spectrum of ceramic phosphor powders which are used in white light-emitting diodes (LEDs) and emit visible light when excited by UV or blue light.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
4 Spherical coordinate system
10 5 Measurement apparatus
5.1 Apparatus configuration
12 5.2 Light source unit
5.3 Sample unit
5.3.1 Cell
5.3.2 Diffuse reflectance standard
5.3.3 Sample stage
13 5.4 Detection unit
5.4.1 Directing optical system
5.4.2 Spectrometer and detector
5.4.3 Amplifier
5.5 Rotational positioning unit
5.5.1 Mechanism for setting angle of incidence
5.5.2 Mechanism for setting zenith angle of observation
5.5.3 Mechanism for setting azimuth angle of observation
5.6 Enclosure
14 5.7 Signal and data processing unit
6 Calibration, inspection and maintenance of measurement apparatus
6.1 General
6.2 Wavelength calibration of light source unit
6.3 Cells
6.4 Diffuse reflectance standard
6.5 Wavelength calibration of detection unit
6.6 Spectral responsivity calibration
6.7 Rotational positioning unit
7 Samples
7.1 Storage and pre-processing
15 7.2 Filling cells with samples
8 Measurement procedures
8.1 Measurement environment
8.2 In-plane spatial distribution measurement
8.2.1 Goniometric measurement of diffuse reflectance standard
8.2.2 Gonio-spectrofluorometric measurement of phosphor sample
16 8.3 Measurement of spatial light distribution with varying azimuth angle of observation
8.4 ​Evaluation of surface uniformity with varying azimuth rotational angle of sample
9 Calculation
9.1 Relative spectral distribution
9.1.1 Spectral responsivity and accumulation time corrections
9.1.2 Mean spectrum for varying azimuth rotational angle of sample
17 9.2 Conversion to photon number-based spectral distribution
18 9.3 Calculation of scattered light and fluorescence photon numbers
9.3.1 Scattered light photon number for diffuse reflectance standard
19 9.3.2 Scattered and fluorescence photon numbers for phosphor sample
20 9.4 Average of scattered light or fluorescence photon number for variable azimuth angle of observation
21 9.5 Luminescent radiance factor and reflected radiance factor
22 9.6 Interpolation of luminescent radiance factor and reflected radiance factor at dead angle
9.7 External quantum efficiency
23 9.8 Internal quantum efficiency
9.9 Absorptance
24 10 Test report
26 Annex A (informative) Gonio-spectrofluorometric measurement for less absorptive samples
28 Bibliography

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BS ISO 23946:2020
$142.49