GB/T 42976-2023 PDF EnglishUS$325.00 · In stock · Download in 9 seconds
GB/T 42976-2023: Nanotechnology - Nano-enabled optoelectrical display - Measurement of optical performance for quantum dot enabled light conversion film Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 42976-2023: Nanotechnology - Nano-enabled optoelectrical display - Measurement of optical performance for quantum dot enabled light conversion film---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT42976-2023 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 31.120 CCS G 31 Nanotechnology - Nano-enabled Optoelectrical Display - Measurement of Optical Performance for Quantum Dot Enabled Light Conversion Film Issued on: SEPTEMBER 7, 2023 Implemented on: APRIL 1, 2024 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 Introduction... 4 1 Scope... 5 2 Normative References... 5 3 Terms and Definitions... 5 4 Symbols... 7 5 Method Principles... 7 6 Instruments and Equipment... 8 7 Test Sample... 11 8 Test Procedures... 11 9 Data Processing... 13 10 Test Report... 16 Appendix A (informative) Test Method with Integrating Sphere... 18 Appendix B (informative) Example of Optical Performance Test of Quantum Dot Light Conversion Film... 22 Bibliography... 27 Nanotechnology - Nano-enabled Optoelectrical Display - Measurement of Optical Performance for Quantum Dot Enabled Light Conversion Film1 ScopeThis document describes the test method for the optical performance of quantum dot light conversion films, including method principles, instruments and equipment, test samples, test procedures, data processing and test report, etc. This document is applicable to the measurement of the optical performance of quantum dot light conversion films for liquid crystal display devices. The measurement of the optical performance of other types of light conversion films may take this as a reference.2 Normative ReferencesThe contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 2410-2008 Determination of the Luminous Transmittance and Haze of Transparent Plastics GB 19510.1-2009 Lamp Controlgear - Part 1.General and Safety Requirements GB/T 20147 CIE Standard Colorimetric Observers GB/T 37664.1-2019 Nanomanufacturing - Key Control Characteristics - Luminescent Nanomaterials - Part 1.Quantum Efficiency3 Terms and DefinitionsThe terms and definitions defined in GB/T 37664.1-2019, and the following are applicable to this document. 3.1 quantum dot Nanoparticles that exhibit size-dependent properties due to the quantum confinement effect of electronic states. [source. GB/T 32269-2015, 4.7] 3.2 quantum dot light conversion film; Q-LCF An optical film that converts high-energy photons of a specific wavelength into low-energy photons of another or several wavelengths through quantum dots. 3.3 peak wavelength The wavelength corresponding to the maximum peak intensity in the spectrum. NOTE. the fluorescence emission spectrum of quantum dot light conversion films usually has multiple emission peaks, and each emission peak corresponds to the peak wavelength of a quantum dot. 3.4 quantum yield The photon emission efficiency of luminescent materials. NOTE. it is the ratio of the number of emitted photons to the number of absorbed photons. [source. GB/T 36081-2018, 3.2, modified] 3.5 haze The ratio of the scattered luminous flux that deviates from the direction of the incident light and passes through the specimen to the transmitted luminous flux. NOTE 1.it is expressed in percentage. NOTE 2.in this document, only scattered luminous flux that deviates from the direction of incident light by more than 2.5 is used to calculate haze. [source. GB/T 2410-2008, 3.1, modified] 3.6 luminous transmittance The ratio of the luminous flux passing through the specimen to the luminous flux irradiating the specimen. NOTE. it is expressed in percentage. [source. GB/T 2410-2008, 3.2, modified] 3.7 luminance uniformity The ratio of the minimum luminance to the maximum luminance in the test area of the quantum dot light conversion film. 3.8 color non-uniformity The maximum chromaticity deviation value between the center and non-center of the test area of the quantum dot light conversion film. 3.9 light conversion efficiency; LCE The ratio of the number of fluorescent photons emitted by the quantum dot light conversion film to the number of absborbed photons of the backlight. 3.10 photon absorptance; PA The ratio of the number of backlight photons absorbed by the quantum dot light conversion film to the number of backlight photons. 3.11 full width at half maximum; FWHM The peak width at half the light intensity of the peak wavelength.4 SymbolsThe following symbols are applicable to this document. H. haze L. luminance Lu. luminance uniformity Lmin. minimum luminance Lmax. maximum luminance T. transmittance WF. full width at half maximum p. peak wavelength (x, y). CIE 1931 standard colorimetric system, chromaticity coordinates5 Method PrinciplesBased on the background test platform, perform quantitative measurement on the optical performance of the quantum dot light conversion film. The key parameters of the optical performance of the quantum dot light conversion film mainly include luminance and luminance uniformity, chromaticity and color non-uniformity, light conversion efficiency and photon absorptance, luminous transmittance and haze. Luminance uniformity and color non-uniformity reflect the consistency of the sample preparation process and are measured using the non- section method. Luminance and chromaticity characterize the optical parameters of the controls the heat emitted by the backlight system to the sample stage, so that the temperature of the sample stage is not higher than 50 C. The backlight shall adopt a light-emitting diode (LED) light source consistent with the display equipment using the quantum dot light conversion film. A light source with a peak wavelength of 447.5 nm 2.5 nm and a full width at half maximum not greater than 20 nm should be used.7 Test SampleThe test sample of the quantum dot light conversion film shall be selected with no curling, cracking, breakage, wrinkles, surface scratches or dirt on the cut surface. Cut it into a size that completely covers the background test area and shall be no less than 18 cm 18 cm. The test sample is randomly cut from one or multiple quantum dot light conversion film samples of the same model, with no less than 3 parallel samples.8 Test Procedures8.1 Backlight System Debugging Before testing the optical performance of the quantum dot light conversion film, the backlight system of the test platform needs to be debugged. The debugging method is as follows. a) Confirm that the test platform is in an unloaded state. b) Turn on the power switch of the backlight system and confirm that the platform is in normal working condition. c) Use a spectral radiometer to measure the radiant illumination or luminance value at the center of the upper surface of the sample stage, and adjust the output power of the power supply, so that the radiant illumination on the surface of the sample satisfies the value agreed upon with the user. d) Pre-heat the backlight system, and the pre-heating time is not less than 30 minutes. After pre-heating, repeat step c). e) Continuously monitor the luminance and chromaticity changes of the backlight. It is required that the luminance change within 5 minutes is not greater than 2%, and the difference between the maximum and minimum chromaticity coordinates is not greater than 0.001. f) During the debugging process, the temperature of the test platform does not exceed 50 C. 8.2 No-load Test In order to measure the fluorescence emission spectrum, luminance and chromaticity values of 7---spectral radiometer. Figure A.1 -- Integrating Sphere Spectral Radiometer The light source is an LED with a peak wavelength of 447.5 nm 2.5 nm. The radiant illumination incident from the light source to the sample surface is not less than 4 mW/cm2, with reference to 6.5. The light source auxiliary part shall use an inverted cone-shaped reflection cup with a surface reflectivity of not less than 90%, so that the light source emits light in a directed manner without light leakage. There is a platform in the vertical direction directly above the light source auxiliary part for the horizontal placement of sample. The transparent sheet keeps the sample flat and close to the light source, so as to avoid backlight leakage. The block screen and light outlet are built-in components of the integrating sphere. The block screen is used to block direct light from the quantum dot light conversion film that directly enters the detector without diffuse reflection. A.2.2 Integrating sphere The specifications of the integrating sphere. ---The diameter is greater than 3 times the maximum size of the test sample; ---Good spatial uniformity; ---Reflectivity greater than 90%; ---Equipped with 4 measurement mode. A.2.3 Spectral radiometer The spectral radiometer measures the spectral radiation power, and the equipment performance complies with the requirements of 6.3. A.3 Test Method A.3.1 Test sample The test sample is prepared in accordance with the requirements of Chapter 7, and the sample size covers the light source range of the integrating sphere. A.3.2 Test procedures A.3.2.1 Light source debugging Before the test, the light source needs to be debugged. The light source debugging process is as follows. a) Make sure the test platform is in an unloaded state; b) Turn on the power switch of the light source system and confirm that the platform is normally operating; c) Pre-heat the backlight system, and the pre-heating time is no less than 30 minutes. After pre-heating, continuously monitor the change in luminous flux of the light source, and the change in luminous flux is required to be no more than 1% within 5 minutes; d) During the debugging process, the ambient temperature shall comply with the content of 6.1. A.3.2.2 Sample test The sample testing procedures are as follows. a) Complete the light source debugging, place a transparent sheet on the light source, and test the radiated power spectrum S0 () in the unloaded state; b) Remove the transparent sheet, place the sample and use the transparent sheet to cover it, and test the radiated power spectrum S1 () of the sample; c) Repeat step b), and successively test the radiated power spectrum of all samples. A.4 Data Processing The calculation method for the quantum yield and absorptance is described below. a) The spectral radiation power S1 () in the unloaded state and spectral radiation power S2 () of the sample. Read the peak wavelength p of each peak in the S2 () spectrum and the full width at half maximum WF corresponding to each peak wavelength. b) Record the wavelength at the lowest luminance point between the first emission peak (light source) and the second emission peak (fluorescence), starting from the low wavelength side of the spectrum, as x nm. Record the band 380 nm ~ x nm as the backlight excitation band and record the band x nm ~ 780 nm as the fluorescence emission band. c) In accordance with Formula (5), respectively calculate the number of photons n1 in the range of 380 nm ~ x nm of the spectrum S1 () and the number of photons n2 in the range of x nm ~ 780 nm; calculate the number of photons n3 in the range of 380 nm ~ x nm of the spectrum S2 () and the number of photons n4 in the range of x nm ~ 780 nm. d) Respectively calculate the quantum yield QY and the absorptance ABs in accordance ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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