Semiconductor devices - Part 5-13: Optoelectronic devices - Hydrogen sulphide corrosion test for LED packages

IEC 60747-5-13:2021 provides the accelerated test method to assess effects of the tarnishing of silver and silver alloys used for LED packages due to hydrogen sulphide. Particularly, this test method is intended to give information on silver and silver alloy tarnishing effects to the luminous/radiant flux maintenance of LED packages. Additionally, this test method can give information on electric performances of LED packages due to corrosion of silver and silver alloys.
The object of this test is to determine the influence of atmospheres containing hydrogen sulphide on parts of LED packages made of: silver or silver alloy; silver or silver alloy protected with another layer; other metals covered with silver or silver alloy.
Testing other degradations that are susceptible to affect luminous/radiant flux maintenance and/or electric performance (e.g. degradation of copper or silicone parts) is not the object of this test. This test might not be suitable as a general corrosion test, i.e. it might not predict the behaviour of flux and/or electric characteristics and connections in industrial atmospheres. This document is applicable to LED packages for lighting applications only if referenced by an IEC SC 34A document.

General Information

Status
Published
Publication Date
14-Jun-2021
Current Stage
PPUB - Publication issued
Completion Date
15-Jun-2021
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IEC 60747-5-13
Edition 1.0 2021-06
INTERNATIONAL
STANDARD
Semiconductor devices –
Part 5-13: Optoelectronic devices – Hydrogen sulphide corrosion test for
LED packages
IEC 60747-5-13:2021-06(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60747-5-13
Edition 1.0 2021-06
INTERNATIONAL
STANDARD
Semiconductor devices –
Part 5-13: Optoelectronic devices – Hydrogen sulphide corrosion test for
LED packages
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.080.99 ISBN 978-2-8322-9852-7

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 60747-5-13:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 7

4 Test apparatus ................................................................................................................ 8

4.1 General ................................................................................................................... 8

4.2 Test jig.................................................................................................................... 8

4.3 Test setup ............................................................................................................... 8

5 Test atmosphere .............................................................................................................. 9

6 Preconditioning................................................................................................................ 9

6.1 General ................................................................................................................... 9

6.2 Hygroscopic treatment ............................................................................................ 9

7 Method .......................................................................................................................... 10

7.1 Initial measurements ............................................................................................. 10

7.2 Procedure ............................................................................................................. 10

7.3 Final measurements.............................................................................................. 11

8 Details to be specified ................................................................................................... 12

Annex A (informative) Information to predict luminous/radiant flux degradation in

particular conditions from the test results .............................................................................. 13

A.1 Correspondence relation between hydrogen sulphide corrosion test and

indoor corrosivity categories ................................................................................. 13

A.2 Correspondence relation between the result of this corrosion test and the

corrosion in the field environment (Case example) ................................................ 14

Annex B (informative) Method for determining the mass increase of silver test pieces ......... 15

B.1 Purpose ................................................................................................................ 15

B.2 Method ................................................................................................................. 15

B.3 Silver test pieces .................................................................................................. 15

B.4 How to place silver test pieces .............................................................................. 15

Annex C (informative) Silver test piece for corrosion monitoring .......................................... 17

C.1 Specimens ............................................................................................................ 17

C.2 Preparation ........................................................................................................... 17

Annex D (informative) Gas concentrations set up of test atmosphere ................................... 18

D.1 General ................................................................................................................. 18

D.2 Reason about no allowable range of each gas concentration ................................ 18

D.3 Application of the actual test ................................................................................. 18

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

Figure 1 – Example of setup ................................................................................................... 9

Figure 2 – Example of LED luminous flux maintenance factor before & after

hygroscopic treatment ........................................................................................................... 10

Figure A.1 – Mass increase example of silver test piece hydrogen sulphide corrosion test .... 14

Figure B.1 – Example of layout of silver test pieces .............................................................. 16

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IEC 60747-5-13:2021 © IEC 2021 – 3 –

Table A.1 – Description of typical environments related to the estimation of indoor

corrosivity categories in ISO 11844-1:2006, Table D.3 .......................................................... 13

Table A.2 – The upper limit of mass increase of silver test pieces in the indoor

environment of corrosivity category in ISO 11844-1:2006 for approximately ten years’

usage ................................................................................................................................... 14

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– 4 – IEC 60747-5-13:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SEMICONDUCTOR DEVICES –
Part 5-13: Optoelectronic devices –
Hydrogen sulphide corrosion test for LED packages
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

IEC 60747-5-13 has been prepared by subcommittee 47E: Discrete semiconductor devices, of

IEC technical committee 47: Semiconductor devices. It is an International Standard.

The text of this International Standard is based on the following documents:
FDIS Report on voting
47E/746/FDIS 47E/751/RVD

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 International Standard 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/standardsdev/publications.
---------------------- Page: 6 ----------------------
IEC 60747-5-13:2021 © IEC 2021 – 5 –

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

devices, 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,
• replaced by a revised edition, or
• amended.
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– 6 – IEC 60747-5-13:2021 © IEC 2021
INTRODUCTION

This part of IEC 60747 provides the accelerated test method to assess effects of the tarnishing

of silver and silver alloys used for LED packages due to hydrogen sulphide, because sulphide

gas (H S) tarnishes silver used in LED packages and causes lumen degradation.

There are some existing environmental stress test standards, but they intend to test contacts

and connections, not LED lumen degradation. IEC 60068-2-43 provides useful information to

assess effects to the contact resistance for contacts and connections due to corrosion of silver

and silver alloy. Because the criterion performance in IEC 60068-2-43 is contact resistance, it

is not applicable to LED packages to determine effects to the luminous/radiant flux maintenance.

For LEDs, light output should be measured, but there is no such provision in existing standards.

Therefore, this document has been drawn up.

This document provides the accelerated test method with mixture gas (H S & NO ) test which

2 2
has the following merits:
• the test method in this document can reproduce the real failure mode;

• the test method in this document works to reproduce the in-situ linear kinetics;

• the test method in this document can reduce the testing duration.

In all tests, the major criterion of performance will be the change in the luminous/radiant flux

and/or electric characteristics (e.g. forward voltage and forward current) caused by sulphide

corrosion.

This test may not be suitable as a general corrosion test, i.e. it may not predict the behaviour

of flux and/or electric characteristics and connections in industrial atmospheres.

This document also contains an informative Annex A that gives information to predict

luminous/radiant flux degradation due to the silver and silver alloy tarnishing in particular

conditions from test results.
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IEC 60747-5-13:2021 © IEC 2021 – 7 –
SEMICONDUCTOR DEVICES –
Part 5-13: Optoelectronic devices –
Hydrogen sulphide corrosion test for LED packages
1 Scope

This part of IEC 60747 provides the accelerated test method to assess effects of the tarnishing

of silver and silver alloys used for LED packages due to hydrogen sulphide. Particularly, this

test method is intended to give information on silver and silver alloy tarnishing effects to the

luminous/radiant flux maintenance of LED packages. Additionally, this test method can give

information on electric performances of LED packages due to corrosion of silver and silver

alloys.

The object of this test is to determine the influence of atmospheres containing hydrogen

sulphide on parts of LED packages made of:
• silver or silver alloy;
• silver or silver alloy protected with another layer;
• other metals covered with silver or silver alloy.

Testing other degradations that are susceptible to affect luminous/radiant flux maintenance

and/or electric performance (e.g. degradation of copper or silicone parts) is not the object of

this test.

This document is applicable to LED packages for lighting applications only if referenced by an

IEC SC 34A document.
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 60068-1, Environmental testing – Part 1: General and guidance

IEC 60068-2-60:2015, Environmental testing – Part 2-60: Tests – Test Ke: Flowing mixed gas

corrosion test

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

diodes
CIE 127, Measurement of LEDs
3 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
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– 8 – IEC 60747-5-13:2021 © IEC 2021
3.1
luminous flux

quantity derived from radiant flux Φ by evaluating the radiation according to its action upon the

CIE standard photometric observer

[SOURCE: IEC 60050-845:2020, 845-21-039, modified – The explanation for photopic vision

has been removed as well as the notes.]
3.2
radiant flux
power emitted, transmitted or received in the form of radiation

[SOURCE: IEC 60050-845:2020, 845-21-038, modified – The definition has been reviewed and

the notes have been removed.]
4 Test apparatus
4.1 General

The test apparatus consists of a climatic system, test enclosure, gas delivery system and means

for measuring gas concentration, detailed in IEC 60068-2-60:2015, Annex B.

Details of design and construction are optional but shall be such that the conditions specified

for the method are fulfilled throughout the working volume and shall comply with the following

requirements:
• water droplets or aerosols shall not be injected into the test enclosure;

• air and water used shall be sufficiently clean in order not to affect performance of the test;

• the test atmosphere shall flow through the enclosure in such a manner as to ensure uniform

test conditions within the working volume;

• the sampling point for gas analyses shall be in the working volume of the test enclosure;

• the exhaust gases shall be treated in accordance with the relevant regulatory stipulations;

• the wet bulb pod shall be placed in the test chamber in such a manner not to exceed 0,1 %

of the cross-section of the test chamber.
4.2 Test jig

If jigs are used to set specimens under test, the jigs shall be made of corrosion-free materials

(e.g. UPVC tube, PTFE, glass, etc.).

The jigs shall also allow air to pass through easily enough so that the wind speed in the test

enclosure is not influenced significantly.
4.3 Test setup
...

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