BS ISO 20351:2017
$102.76
Fine ceramics (advanced ceramics, advanced technical ceramics). Absolute measurement of internal quantum efficiency of phosphors for white light emitting diodes using an integrating sphere
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 18 |
This document specifies 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 diodes (LEDs).
This document can be adopted for the measurement of phosphors used in non-white LEDs, for example, green, orange, pink or purple LEDs.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | Foreword |
| 7 | Introduction |
| 8 | 1 Scope 2 Normative references 3 Terms and definitions |
| 9 | 4 Measuring equipment 4.1 Equipment configuration |
| 10 | 4.2 Light source unit 4.3 Sample unit 4.3.1 Cell |
| 11 | 4.3.2 White diffuser or reference cell 4.3.3 Integrating sphere 4.4 Detecting unit 4.4.1 Directing optics 4.4.2 Spectrometer and detector 4.4.3 Amplifier 4.5 Signal and data processing unit |
| 12 | 5 Calibration, checking and maintenance of measuring equipment 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 detecting unit 5.6 Spectral responsivity correction 6 Samples 6.1 Storage and pre-processing 6.2 Filling cells with samples |
| 13 | 7 Measurement methods 7.1 Measurement environment 7.2 Light spectrum without phosphor sample 7.3 Light spectrum with phosphor sample 8 Calculations 8.1 Conversion to photon-number-based spectra |
| 14 | 8.2 Photoluminescence spectrum 8.2.1 General 8.2.2 Method 1 8.2.3 Method 2 8.3 Internal quantum efficiency 8.3.1 Relative number of absorbed photons |
| 15 | 8.3.2 Relative number of photoluminescent photons 8.3.3 Internal quantum efficiency 9 Report |
| 17 | Bibliography |
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ISO 20351:2017
Fine ceramics (advanced ceramics, advanced technical ceramics) — Absolute measurement of internal quantum efficiency of…
