IEC 60747-5-13:2021 pdf download

IEC 60747-5-13:2021 pdf download.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
4 Test apparatus General
4.1 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 If multiple specimens are tested, each specimen shall be set in the same posture. See Figure 1 as an example. The distance between specimens should be 10 mm or more. Corrosive materials or objects including corrosive materials (e.g. silver) other than the test specimens shall not be set in the test enclosure.The test atmosphere may be obtained by mixing hydrogen sulphide and nitrogen dioxide (from any convenient source) with air and water vapour in a way to ensure a homogeneous mixture. (More than one stage may be necessary to obtain a homogeneous distribution of the small quantity of hydrogen sulphide.)