IEC TS 62607-3-5:2026

• Abstract:

  IEC TS 62607-3-5:2026, which is a Technical Specification, establishes a standardized method to determine the optical key control characteristic; • light conversion efficiency; for quantum dot enabled light conversion films (Q-LCFs) by; • luminance meter.; The light conversion efficiency is derived by the photoluminescence spectrum.; The typical application areas of this standardized measurement method are the nano-photoelectric display devices using Q-LCF as key component, and other relevant optical conversion devices.; WARNING – Persons using this document should be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions.

• Status: Published
• Publication Date: 25-Aug-2026
• ICS: 07.120 - Nanotechnologies
• Technical Committee: TC 113 - Nanotechnology for electrotechnical products and systems
• Drafting Committee: WG 10 - TC 113/WG 10
• Current Stage: PPUB - Publication issued
• Start Date: 26-Aug-2026
• Completion Date: 21-Aug-2026

IEC TS 62607-3-5:2026 is an IEC Technical Specification for nanomanufacturing. It specifies a luminance-meter method for measuring the light conversion efficiency (LCE) of quantum dot enabled light conversion films (Q-LCFs), mainly for nano-photoelectric display devices and other optical conversion devices. The method derives LCE from the photoluminescence spectrum, so suppliers, manufacturers, and purchasers can compare films using common laboratory equipment.

What does IEC TS 62607-3-5:2026 specify?

IEC TS 62607-3-5:2026 specifies a standardized test method for the optical key control characteristic light conversion efficiency of Q-LCFs measured by a luminance meter. It is organized into Scope, terms and abbreviations, general measurement conditions, the measurement method, and the test report.

The scope ties the document to Q-LCFs and to display-related optical conversion uses. The introduction also notes use with other quantum dot conversion members such as a quantum dot diffusing plate. For a reader, that means the document is aimed at film performance measurement in display manufacturing and similar optical components, not at general quantum dot synthesis.

What are the key requirements of IEC TS 62607-3-5:2026?

IEC TS 62607-3-5:2026 requires controlled ambient conditions, a dark test environment, a defined backlight measurement set-up, calibrated instruments, prepared samples, stabilized backlight settings, and a specific calculation and reporting method.

• Clause 4.1 - Ambient conditions. The test environment is limited to 21 °C to 25 °C, 20 % to 80 % relative humidity, and 86 kPa to 106 kPa atmospheric pressure. If other conditions are used, they must be reported. In practice, this lets labs compare results under a known environment.

• Clause 4.2 - Darkroom conditions. The darkroom surface reflection ratio must be below 10 %, and illuminance with the LMD and DUT off must be below 0.1 lx. If background light is different, it must be deducted and stated in the report. This reduces stray light effects on luminance readings.

• Clause 4.3 and Figure 1 - Measurement system. The measurement uses a display backlight test platform and a spectral radiance measurement instrument placed perpendicular to the test area. The sample placement table shall be stable, and a glass thin plate is recommended. This defines the geometry needed for repeatable optical measurements.

• Clause 5.2 - Spectral radiance measurement instrument. The instrument must meet limits for wavelength error, field of view, spectral bandwidth, chromaticity precision, linear error, stability error, and luminance inaccuracy, and it must have a luminance calculation function. In practice, the calculation depends on an instrument that can resolve the spectral shape accurately enough.

• Clause 5.3 - Display backlight test platform. The prism film, sample table, and backlight must be arranged perpendicular to the light path. The backlight shall match the display device, and the default peak wavelength and FWHM are specified for the backlight. The minimum-to-average illuminance ratio in the sample area must be at least 90 %. This keeps the excitation field uniform enough for meaningful comparison.

• Clause 5.4 and 5.5 - Sample preparation and backlight setting. Samples are cut from Q-LCF with good appearance, at least 20 cm × 20 cm, and three or more samples from the same Q-LCF are tested. The backlight is adjusted to standard luminance and must stabilize so luminance changes stay within 2 % over five minutes. That helps separate sample performance from lighting drift.

• Clause 5.6 - Calculation. The method measures spectra with and without the Q-LCF, separates excitation and fluorescence bands, converts radiance to photon number, and calculates LCE from the two spectra. This links the result directly to the film’s conversion behavior rather than to a single brightness reading.

• Clause 6 - Test report. The report includes LCE, photoluminescence wavelength, and FWHM, together with ambient conditions, sample information, instrument data, and the backlight and luminance results. That gives buyers and manufacturers the traceability needed for quality records.

What terms does IEC TS 62607-3-5:2026 define?

• Quantum dot (QD): A crystalline nanoparticle whose electronic states show size-dependent properties because of quantum confinement.
• Quantum dot enabled light conversion film (Q-LCF): An optical film based on quantum dots that converts high-energy light at one wavelength into lower-energy light at another wavelength.
• Light conversion efficiency (LCE): The ratio of photons emitted by the Q-LCF to photons absorbed from the backlight.
• Device under test (DUT): The sample being measured in the test set-up.
• Full width at half maximum (FWHM): The width of the photoluminescence peak measured at half of its maximum height.
• Effective quantum yield (EQY): A term used in some references for the same kind of light conversion performance described here as LCE.

Who uses IEC TS 62607-3-5:2026?

IEC TS 62607-3-5:2026 is used by Q-LCF suppliers, purchasers, display manufacturers, and test laboratories. It supports manufacturing quality control, incoming inspection, product comparison, and verification of whether a film gives the expected luminance and conversion performance.

The introduction points to display products, especially liquid crystal displays using blue LED backlights, and to other optical conversion devices. In practice, the document is useful when teams need a reproducible way to check whether quantum dots remain stable in the film matrix and whether the film matches the display backlight.

What does the IEC TS 62607-3-5:2026 document contain?

IEC TS 62607-3-5:2026 contains a standard measurement system figure, a schematic structure of Q-LCF, the measurement procedure, calculation formulas for photon number and LCE, and a blank test report table. It also gives the reporting items for backlight, luminance, excitation and emission bands, and photoluminescence parameters.

For design, testing, and quality control work, the most useful parts are the set-up description in Clause 4, the instrument and backlight requirements in Clause 5, and the report template in Clause 6. The bibliography also points to related scientific and patent literature on light conversion efficiency and quantum dot films.

IEC TS 62607-3-5 ®
Edition 1.0 2026-08
TECHNICAL
SPECIFICATION
Nanomanufacturing - Key control characteristics -
Part 3-5: Nanophotonic products - Light conversion efficiency of quantum dot
enabled light conversion films: luminance meter
ICS 07.120  ISBN 978-2-8327-1401-0

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CONTENTS
FOREWORD . 2
INTRODUCTION . 4
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and abbreviated terms . 5
3.1 Terms and definitions . 5
3.2 Abbreviated terms. 6
4 General . 6
4.1 Ambient conditions for measurement . 6
4.2 Standard darkroom conditions for LCE test. 6
4.3 Measurement system for LCE test . 7
5 Measurement of light conversion efficiency . 8
5.1 General . 8
5.2 Spectral radiance measurement instrument . 8
5.3 Display backlight test platform . 8
5.4 Sample preparation. 8
5.5 Backlight setting . 9
5.6 Measurement procedure . 9
6 Test report . 10
Bibliography . 12

Figure 1 – Standard measurement system . 7
Figure 2 – Schematic structure of Q-LCF . 9

Table 1 – Test report - LCE of Q-LCF (blank) . 11

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Nanomanufacturing - Key control characteristics -
Part 3-5: Nanophotonic products - Light conversion efficiency
of quantum dot enabled light conversion films: luminance meter

FOREWORD
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IEC TS 62607-3-5 has been prepared by IEC technical committee 113: Nanotechnology for
electrotechnical products and systems. It is a Technical Specification.
The text of this Technical Specification is based on the following documents:
Draft Report on voting
113/957/DTS 113/986/RVDTS
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Specification is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts of the IEC 62607 series, published under the general title Nanomanufacturing -
Key control characteristics, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
INTRODUCTION
This document specifies how to measure the light conversion efficiency, which is one of key
control characteristics of quantum dot enabled light conversion films (Q-LCFs).
Quantum dot (QD) is a kind of representative nanomaterial, has typical quantum confinement
effects and exhibits distinct size-dependent properties, that is, the luminescence peak is
adjustable with the QD size. QDs have broad absorption spectra, as the absorption edge is
continuous for all wavelengths shorter than the absorption edge. They are also known for
narrow emission spectra – a trait that arises when QDs are consistent in both size and
composition. Using the same excitation source, commonly blue light-emitting diode, to excite
quantum dots of different particle sizes, QDs of different particle sizes can emit spectra with
different peak wavelengths which are larger than the excitation wavelength. Based on the above
unique characteristics, Q-LCFs are used in display products, greatly improving the colour gamut.
Currently Q-LCFs are widely adopted by television makers (manufacturers, suppliers, etc.) to
add a new feature to liquid crystal displays.
Although they have such advantageous features, quantum dots are sensitive to water, oxygen,
light, high temperature and so on. During the manufacturing process of Q-LCFs, various
chemicals are used to form a solid matrix in which quantum dots are dispersed. After the
quantum dots have been encapsulated in the films, water and oxygen still can pass through the
polymer matrix and reach the quantum dots to a certain degree, depending on the barrier
property of the matrix and encapsulation layer. During and after manufacturing, adverse effects,
such as lowering of quantum efficiency and stability of quantum dots, will occur.
It is critical to measure quantum efficiency of quantum dots in Q-LCFs; however, measurement
of this characteristic by integrating sphere is relatively complicated and of low test efficiency,
the integrating sphere test has limitations, such as the sample size must be smaller than the
size of the integrating sphere, and the luminance range of backlight is narrow. The light
conversion efficiency (LCE) parameter is more meaningful than the quantum efficiency (QE)
parameter in practical industrial applications, as the LED backlight usually has higher luminance.
For measuring LCE, a luminance meter is used as the test tool, which only measures the number
of photons within 2π steradian directly in front of the backlight after excitation of the sample.
This is significantly less than the number of photons collected by the integrating sphere. So the
light conversion efficiency (LCE) measured by this document is directly related to the luminance
actually detected in the display industry, whereas the quantum efficiency is not. It is for this
reason that LCE, a more straightforward characteristic, is measured instead. Brighter Q-LCFs
correlate with higher quantum efficiency of the quantum dots inside the film.
These characteristics will enable supplier and purchas
...