GB/T 42976-2023 PDF English
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GB/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 Contents
Foreword... 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 Film
1 Scope
This 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 References
The 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 Efficiency
3 Terms and Definitions
The 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 Symbols
The 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 coordinates
5 Method Principles
Based 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 Sample
The 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 Procedures
8.1 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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