Transcription of AN122 Chemical compatibility of LEDs - dammedia.osram.info
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AN122 Chemical compatibility of LEDs - dammedia.osram.info
1 / 292018-08-06 | Document No.: AN122 NoteChemical compatibility of LEDsAbstractThe performance and stability of light emitting diodes ( leds ) may be influenced by variouschemical incompatibilities arising from chemicals and materials used, amongst otherthings, in luminaire construction, or by gases in the proximate environment of leds duringfield operation. Nevertheless, leds have to fulfill a wide range of customer needs andrequirements in indoor and outdoor application note provides information on the Chemical compatibility of certainsubstances with leds , particularly with regard to some of their basic components. In thiscontext, the main mechanisms of Chemical incompatibility are illustrated using examples ofblue and white leds . In addition, material evaluation results and selection guidelines areprovided to support our customers in performing compatibility tests for their for:all OSRAM Opto Semiconductors LEDsAuthors: Bartling Hanna / I-Hsin LinApplication Note No.
Figure 3 illustrates the concept of thermal oxidation, free radical formation and shows images of a thermoplastic-based housing material before and after discoloration occurs. Silicone-based housing materials have a relatively high thermal stability. This broader temperature stability range makes silicone a suitable candidate for LED housings.
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