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(Color online) Schematic of InGaN QWs LEDs structure utilizing microspheres microlens array.
(Color online) Process flow schematic of microspheres microlens arrays on InGaN QW LEDs samples via rapid convective deposition.
(Color online) (a) Confocal laser scanning microscopy and (b) scanning electron microscopy images of microlens array on top of InGaN QWs LED structure. The colloidal crystal forms 2D hexagonal closed-packed microlens arrays.
(Color online) Comparison of photoluminescence intensity of QW samples with and without microlens array, with He–Cd excitation lasers at room temperature.
(Color online) Comparison of relative light output power and external quantum efficiency vs injected current for QW LEDs with and without microlens array, emitting at . The measurements were conducted under CW operation at room temperature.
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