Fig. 1. (a) Schematic structures of green Polar. and Ref. LDs, respectively. (b) Sample structure for Hall measurements, the dash line shows the current pathway in measurement.

Fig. 2. Simulated optical field distribution of (a) LDs with DPD p-CL and (b) LDs with Mg doping p-CL. Insets show the enlarged distribution around p-CL.

Fig. 3. (a) Power-current (P-I) curves and (b) laser spectra of green LDs with DPD and conventional Mg doping p-CL, respectively. The solid line in (a) is a guide for the eye.

Fig. 4. TDPL result of Polar. LD. The solid line is the result of Arrhenius fitting.

Fig. 5. Current-voltage (I-V) curves of green LDs with DPD and Mg doping p-CL, respectively.