1 research outputs found
Ultraviolet Light Stable and Transparent Sol–Gel Methyl Siloxane Hybrid Material for UV Light-Emitting Diode (UV LED) Encapsulant
An
ultraviolet (UV) transparent and stable methyl-siloxane hybrid
material was prepared by a facile sol–gel method. The transparency
and stability of a UV-LED encapsulant is an important issue because
it affects UV light extraction efficiency and long-term reliability.
We introduced a novel concept for UV-LED encapsulation using a thermally
curable oligosiloxane resin. The encapsulant was fabricated by a hydrosilylation
of hydrogen-methyl oligosiloxane resin and vinyl-methyl siloxane resin,
and showed a comparable transmittance to polydimethylsiloxane (PDMS)
in the UVB (∼300 nm) region. Most remarkably, the methyl-siloxane
hybrid materials exhibited long-term UV stability under light soaking
in UVB (∼300 nm) for 1000 h