Liu Qiaoli

Polarization-Stable 980nm Vertical-Cavity Surface-Emitting Lasers with Diamond-Shaped Oxide Aperture*

Polarization-stable 980nm oxide-confined vertical-cavity surface-emitting lasers with 3 μm diamond-shaped aperture are fabricated by comprehensively utilizing the anisotropic properties of wet etching and wet nitrogen oxidation of III–V semiconductor materials. Polarization-stable operation along the major axis of the diamond-shaped oxide aperture with 11 dB orthogonal polarization suppression ratio is achieved in a temperature range of 15–55°C from the threshold to 4 mA.

Phosphor-free white light-emitting diodes*

The multiple color-matching schemes that could improve the color rendering index for phosphor-free white LEDs are discussed. Then we review a few of the recent research directions for phosphor-free white LEDs, which include the development of monolithic GaN-based white LEDs and hybrid integrated GaN-based and AlGaInP-based white LEDs. These development paths will pave the way toward commercial application of phosphor-free white LEDs in the coming years.