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GB/T 24981.1-2020 PDF English

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GB/T 24981.1-2020: Test methods of rare earth long afterglow phosphors - Part 1: Determination of emission dominant peak and chromaticity coordinates
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GB/T 24981.1: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
GB/T 24981.1-202095 Add to Cart Auto, 9 seconds. Test methods of rare earth long afterglow phosphors - Part 1: Determination of emission dominant peak and chromaticity coordinates Valid
GB/T 24981.1-2010199 Add to Cart 2 days Test methods of long afterglow phosphors activated by rare earths -- Part 1: Determination of emission dominant peak and chromaticity coordinates Obsolete

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GB/T 24981.1-2020: Test methods of rare earth long afterglow phosphors - Part 1: Determination of emission dominant peak and chromaticity coordinates


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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.120.99 H 14 Replacing GB/T 24981.1-2010 Test methods of rare earth long afterglow phosphors - Part 1: Determination of emission dominantpeak and chromaticity coordinates ISSUED ON: NOVEMBER 19, 2020 IMPLEMENTED ON: OCTOBER 01, 2021 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.

Table of Contents

Foreword ... 3 1 Scope ... 4 2 Method principle ... 4 3 Instruments and devices ... 4 4 Test procedures ... 5 5 Precision ... 6 References ... 7 Test methods of rare earth long afterglow phosphors - Part 1: Determination of emission dominantpeak and chromaticity coordinates

1 Scope

This Part of GB/T 24981 specifies the determination method of emission dominantpeak and chromaticity coordinates of rare earth long afterglow phosphors. This Part applies to the determination of emission dominantpeak and chromaticity coordinates of rare earth long afterglow phosphors.

2 Method principle

The sample emits visible light of 380 nm ~ 720 nm under the excitation of 365 nm ultraviolet rays; the monochromatic light signal is converted into an electrical signal by the spectral radiation tester for spectroscopy and photoelectric conversion; then, the electrical signal value corresponding to the light intensity is obtained by correction of the standard lamp. Measure the entire visible light band at a certain wavelength interval; obtain the relative emission spectral power distribution of the sample in the entire visible light band; calculate the chromaticity coordinates and emission dominantpeak of the light emitted by the sample with reference to CIE 1931.

3 Instruments and devices

3.1 Spectral radiation tester The spectral radiation tester shall meet the following conditions: a) Wavelength accuracy: ±2 nm; b) Accuracy of chromaticity coordinates: ±0.001; c) Spectral range: 380 nm ~ 720 nm. 3.2 Excitation light source The 365 nm ultraviolet low pressure mercury lamp is equipped with a color filter; the peak transmittance of the filter shall be greater than 10%; transmittance of 380 nm ~ 720 nm shall not be greater than 0.01%; the radiation intensity stability of 365 nm shall be better than 0.2%/10 min, otherwise, it shall be compensated. 3.3 Sample pan The sample pan is black, with an inner diameter of 20 mm and a depth of 3 mm.

4 Test procedures

4.1 Test conditions 4.1.1 Ambient temperature: 22 °C ~ 27 °C. 4.1.2 Relative humidity: ≤70%. 4.1.3 During the measurement process, in addition to the specified excitation light source, there shall be no stray light interference such as visible light or ultraviolet light. 4.2 Instrument calibration Be stable for 10 min ~ 30 min according to the requirements of the instrument. Refer to the instrument manual to calibrate the instrument. 4.3 Test 4.3.1 Load the sample into the sample pan; compact and make the surface flat. 4.3.2 Place the sample pan in the sample chamber to be excited, so that the sample is excited by the ultraviolet lamp. 4.3.3 Irradiate the sample under an ultraviolet lamp for more than 1 min; scan from the 380 nm ~ 720 nm wavelength range; measure the relative spectral power distribution of the sample and the peak wavelength of the emission dominantpeak. The emission dominantpeak is expressed by the peak wavelength (λ). 4.3.4 According to the measured relative spectral power distribution, calculate the chromaticity coordinates (x, y) with reference to CIE 1931. 4.3.5 Repeat the test 3 times for a sample; take the arithmetic mean value. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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