Abstract: A LED-based light emitting device having integrated rectifier circuit driven directly by an AC voltage and a related fabrication method is provided herein. The light emitting mainly contains a lower substrate and an upper substrate. The lower substrate has a built-in rectifier circuit and appropriate electrical contacts of the rectifier circuit are exposed on the top surface of the lower substrate. The upper substrate contains multiple LEDs arranged in an N×M array and the LEDs are all electrically insulated from each other. Metallic plating techniques are applied to establish electrical connection between these LEDs so that they jointly form a circuit matching the rectifier circuit on the lower substrate. The two substrates are faced towards each other and metallic bumps are applied to connect the LED circuit on the upper substrate to the rectifier circuit on the lower substrate, completing a fully function light emitting device.

Abstract: An oxide-confined vertical cavity surface emitting laser (VCSEL) device and the method for manufacturing the same are disclosed. After completing the oxidation procedure for the oxide-confined VCSEL, a filling material is deposited on the etched groove. This procedure can planarize the etched device surface for subsequent fabrication of a metal electrode. The invention can improve the device yield and the properties at the same time.

Abstract: This specification discloses a VCSEL (Vertical Cavity Surface-Emitting Laser) device with single-mode output. This device is given by coating a layer of antireflection-coating (AR-coating) film on a normal VCSEL device with multiple transverse mode output and forming a light-emitting window on the AR-coating film. Since the AR-coating film can lower the reflectivity of the VCSEL device with multiple transverse mode output and the Bragg reflector at the bottom of the AR-coating film, it is easier to form single-mode laser light when the current flows through areas not covered by the AR-coating film, outputting a single-mode laser beam. Through the power-current character curve and the spectrum properties, one can find an optimal electrical current value for controlling single-mode light output.

Abstract: A process for diffusing Cd into an InP substrate comprising:a. pre-heating a sealed tube containing red P and Cd.sub.3 P.sub.2 at the opening of a diffusion furnace;b. effecting the diffusion within the diffusion furnace; andc. furnace cooling the sealed tube at the opening of the diffusing furnace.