Abstract: A light-emitting device with an array of window openings to enhance the light extraction efficiency from this device is provided. This array of window openings is employed to create a much larger sidewall area to enhance the light extraction from the sidewalls of these openings. With this array of window openings, photons trapped due to the total internal reflection can propagate within the device and be extracted from the sidewalls of these openings. A variation of designs can be applied to the array of window openings. Even the shape of these openings can be designed such that the area of the sidewalls is increased. Large-sized light-emitting diodes can improve the light extraction efficiency by employing the array of window openings.