6TH INTERNATIONAL ISTANBUL CURRENT SCIENTIFIC RESEARCH CONGRESS
ANALYSIS OF POLYMER COMPOSITES REFRACTIVITY ROLE ON LOWERING OPTICAL LOSSES IN LIGHT EMITTING DIODES
Yazarlar:
Andreea Irina BARZIC
Raluca Marinica ALBU
Iuliana STOICA
Victor COJOCARU
Yayıncı:
Liberty Publications
Materials science is an important research field with widespread implication in many industries, ranging from medicine, agriculture to energy and opto-electronics. Polymers have been widely recognized as being one of the most relevant categories of materials due to their excellent range of properties, such as lightweight, reduced costs, facile processability, mechanical resistance, and (in some cases) great optical clarity. For specific applications, there are some properties that must be additionally improved, so that the formulated approaches are particularized based on the pursued goal. For example, when macromolecular compounds are used as encapsulants for light emitting diodes (LEDs), the refractive index must be adapted to match that of the adjacent semiconductor sheet. The goal of this study was to propose new polymer materials with adjusted refractivity for reducing optical losses in LEDs. The foreseen solution is to associate a transparent polymer, like polyvinyl alcohol, with distinct amounts of a mixture of highly polarizable inorganic particles, namely titanium dioxide and zinc sulfide. The filler blend will lead to new composites with higher refractive index, while the transparency is kept at a suitable level. Also, the relation between the refractive index and the optical gap was examined for every sample. The optical losses at encapsulant and semiconductor interface are evaluated and discussed based on the specimen composition. The data are essential for designing encapsulants that are reducing the optical losses in LEDs.
