Semiconductor devices - Part 5-9: Optoelectronic devices - Light emitting diodes - Test method of the internal quantum efficiency based on the temperature-dependent electroluminescence

IEC 60747-5-9:2019(E) specifies the measuring method of the internal quantum efficiency (IQE) of single light emitting diode (LED) chips or packages without phosphor. White LEDs for lighting applications are out of the scope of this document. This document utilizes the relative external quantum efficiencies (EQEs) measured at cryogenic temperatures and at an operating temperature, which is called temperature-dependent electroluminescence (TDEL). In order to identify the reference IQE of 100 %, the maximum values of the peak EQE are found by varying the environmental temperature and current.

General Information

Status
Published
Publication Date
10-Dec-2019
Current Stage
PPUB - Publication issued
Completion Date
11-Dec-2019
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IEC 60747-5-9:2019 - Semiconductor devices - Part 5-9: Optoelectronic devices - Light emitting diodes - Test method of the internal quantum efficiency based on the temperature-dependent electroluminescence
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IEC 60747-5-9
Edition 1.0 2019-12
INTERNATIONAL
STANDARD
colour
inside
Semiconductor devices –
Part 5-9: Optoelectronic devices – Light emitting diodes – Test method of the
internal quantum efficiency based on the temperature-dependent
electroluminescence
IEC 60747-5-9:2019-12(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60747-5-9
Edition 1.0 2019-12
INTERNATIONAL
STANDARD
colour
inside
Semiconductor devices –
Part 5-9: Optoelectronic devices – Light emitting diodes – Test method of the
internal quantum efficiency based on the temperature-dependent
electroluminescence
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.080.99 ISBN 978-2-8322-7656-3

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 60747-5-9:2019 © IEC:2019
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms, definitions and abbreviated terms ........................................................................ 5

3.1 Terms and definitions .............................................................................................. 5

3.2 Abbreviated terms ................................................................................................... 7

4 Measuring methods ......................................................................................................... 7

4.1 Basic requirements ................................................................................................. 7

4.1.1 Measuring conditions ....................................................................................... 7

4.1.2 Measuring instruments and equipment ............................................................. 7

4.2 Purpose .................................................................................................................. 7

4.3 Measurement .......................................................................................................... 8

4.3.1 Measurement setup ......................................................................................... 8

4.3.2 Measurement principle..................................................................................... 8

4.3.3 Measurement sequence ................................................................................. 11

5 Test report ..................................................................................................................... 12

Annex A (informative) Test examples ................................................................................... 13

A.1 Test example (category 1) .................................................................................... 13

A.2 Test example (category 2) .................................................................................... 16

Bibliography .......................................................................................................................... 19

Figure 1 – Example of the measurement setup with the TDEL ................................................. 8

Figure 2 – Schematic diagram of radiant power as a function of forward current at

various temperatures .............................................................................................................. 9

Figure 3 – Examples of relative EQEs showing whether the IQE is measurable or not .......... 10

Figure 4 – IQE measurement with TDEL ............................................................................... 10

Figure 5 – Sequence of IQE determination with TDEL ........................................................... 12

Figure A.1 – Radiant power as a function of forward current at various temperatures

(category 1) .......................................................................................................................... 13

Figure A.2 – Relative EQE as a function of forward current at various temperatures

(category 1) .......................................................................................................................... 14

Figure A.3 – Check T in relative EQE curves (category 1) ................................................... 14

Figure A.4 – Evaluation of the relative EQE (category 1) ....................................................... 15

Figure A.5 – IQE as a function of forward current at various temperatures including an

operating temperature (category 1) ....................................................................................... 15

Figure A.6 – Radiant power as a function of forward current at various temperatures

(category 2) .......................................................................................................................... 16

Figure A.7 – Relative EQE as a function of forward current at various temperatures

(category 2) .......................................................................................................................... 17

Figure A.8 – Check T in relative EQE curves (category 2) ................................................... 17

Table A.1 – Summary of test report ....................................................................................... 18

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IEC 60747-5-9:2019 © IEC:2019 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SEMICONDUCTOR DEVICES –
Part 5-9: Optoelectronic devices – Light emitting diodes –
Test method of the internal quantum efficiency based
on the temperature-dependent electroluminescence
FOREWORD

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International Standard IEC 60747-5-9 has been prepared by subcommittee 47E: Discrete

semiconductor devices, of IEC technical committee 47: Semiconductor devices.
The text of this International Standard is based on the following documents:
CDV Report on voting
47E/651/CDV 47E/676/RVC

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

---------------------- Page: 5 ----------------------
– 4 – IEC 60747-5-9:2019 © IEC:2019

A list of all parts in the IEC 60747 series, published under the general title Semiconductor

devices, can be found on the IEC website.

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---------------------- Page: 6 ----------------------
IEC 60747-5-9:2019 © IEC:2019 – 5 –
SEMICONDUCTOR DEVICES –
Part 5-9: Optoelectronic devices – Light emitting diodes –
Test method of the internal quantum efficiency based
on the temperature-dependent electroluminescence
1 Scope

This part of IEC 60747 specifies the measuring method of the internal quantum efficiency

(IQE) of single light emitting diode (LED) chips or packages without phosphor. White LEDs for

lighting applications are out of the scope of this document. This document utilizes the relative

external quantum efficiencies (EQEs) measured at cryogenic temperatures and at an

operating temperature, which is called temperature-dependent electroluminescence (TDEL).

In order to identify the reference IQE of 100 %, the maximum values of the peak EQE are

found by varying the environmental temperature and current.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

IEC 60747-5-6:2016, Semiconductor devices – Part 5-6: Optoelectronic devices – Light

emitting diodes
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
radiant power
power emitted, transmitted or received in the form of radiation

Note 1 to entry: The unit used is: W. Radiant power is also known as the "radiant flux".

[SOURCE: IEC 60747-5-8:2019, 3.1.1]
3.1.2
internal quantum efficiency
IQE

ratio of the number of photons emitted from the active region per unit time to the number of

electrons injected into the LED per unit time
---------------------- Page: 7 ----------------------
– 6 – IEC 60747-5-9:2019 © IEC:2019
Φ hν
e,active
η =
IQE
where
Φ is the radiant power emitted from the active region
e,active
hν is the mean photon energy
I is the forward current
q is the elementary charge

Note 1 to entry: It is in general a function of ambient temperature (T ) and forward current (I ).

a F
[SOURCE: IEC 60747-5-8:2019, 3.2.4, modified – The note has been added.]
3.1.3
external quantum efficiency
EQE

ratio of the number of photons emitted into the free space per unit time to the number of

electrons injected into the LED per unit time
Φ hν
η =
EQE
where
Φ is the radiant power

Note 1 to entry: It is in general a function of ambient temperature (T ) and forward current (I ).

a F
[SOURCE: IEC 60747-5-8:2019, 3.2.3, modified – The note has been added.]
3.1.4
injection efficiency

ratio of the number of electrons injected into the active region per unit time to the number of

electrons injected into the LED per unit time
F,active
η =
where
I is the portion of the forward current injected into the active region
F,active
[SOURCE: IEC 60747-5-8:2019, 3.2.6]
3.1.5
radiative efficiency

ratio of the number of photons emitted from the active region per unit time to the number of

electrons injected into the active region per unit t
...

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