IEC 60747-5-13 pdf – Semiconductor devices – Part 5-13: Optoelectronic devices – Hydrogen sulphide corrosion test for LED packages

IEC 60747-5-13 pdf – Semiconductor devices – Part 5-13: Optoelectronic devices – Hydrogen sulphide corrosion test for LED packages
1Scope
This part of lEC 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. Particularlty，thistest method is intended to give information on silver and silver alloy tarnishing effects to theluminous/radiant flux maintenance of LED packages. Additionally，this test method can giveinformation on electric performances of LED packages due to corrosion of silver and siveralloys.
The object of this test is to determine the influence of atmospheres containing hydrogensulphide on parts of LEDpackages made of:
-silver or silver alloy;
-silver or silver allay protected with another layer;- other metals covered with silver or silver alloy.
Testing other degradations that are susceptible to affect luminous/radiantflux maintenanceand/or electric performance (e.g. degradation of copper or silicone parts) is not the object ofthis test.
This document is applicable to LED packages for lighting applications only if referenced by anIEc SC 34A document.
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies.
For undated references,the latestedition of the referenced document(including anyamendments) applies.
IEG 60068-1 , Environmental testing – Part 1: General and guidance
IEC 60068-2-60;2015 ，Environmental testing – Part 2-60:Tests -Test Ke:Flowing mixed gascorrosion test
IEC 60747-5-6，Semiconductor devices – Part 5-6:Optoelectronic devices – Light emittingdiodes
CIE 127 , Measurement of LEDs
3Terms and definitions
For the purposes of this document, the following terms and definitions apply. IS0 and IECmaintain terminological databases for use in standardization at the following addresses:
-IEC Electropedia: available at http://www.electropedia.orgl
– so Online browsing platform: available at http:./www.iso.org/obp
3.1
luminous fluxpv
quantity derived from radiant flux be by evaluating the radiation according to its action upon thecIEstandard photometric observer
[SOURCE: IEC 60050-845;2020,845-21-039,modified – The explanation for photopic visionhas been removed as well as the notes.]
3.2
radiant fluxe
power emitted, transmitted or received in the form of radiation
[SOURCE: IEC 60050-845:2020,845-21-038, modified -The definition has been reviewed andthe notes have been removed.]
4Test apparatus
4.1General
The test apparatus consists of a climatic system, test enclosure, gas delivery system and meansfor measuring gas concentration, detailed in lEC 60068-2-60:2015,Annex B.
Details of design and construction are optional but shall be such that the conditions specifiedfor the method are fulfilled throughout the working volume and shall comply with the followingrequirements:
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 uniformtest 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.
4.2Test jig
lf 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 speedin the testenclosure is not influenced significantly.