Abstract
A simple and low-cost method for fabricating lens with large
view angle was proposed based on droplet evaporation for high-power
light-emitting diodes (LEDs). In such a method, an immiscible and
vaporizable droplet was deposited on the top surface of a liquid silicone
lens. By applying a heat load, the silicone was cured and the droplet
was evaporated simultaneously. Then, lenses with craters were fabricated
for large view-angle emission of LEDs. In experiments, the diameter
and depth of the crater on the lens surface were controlled by adjusting
the volume of droplet. As a result of the variation of carter size,
light intensity distributions (LIDs) of LED modules were obviously
modulated. Compared with traditional spherical cap lens, the view
angles of the maximum light intensity of the fabricated lens varied
from 0
$^{\circ}$
to
$\pm
{{54}}^{\circ}$
. Meanwhile, the maximum light
intensity increased by 17%.
© 2015 IEEE
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