Efficient Alternating Current Operated White Light-Emitting Diode Chip

• Published in: IEEE photonics technology letters Vol. 21; no. 1; pp. 33 - 35
• Main Authors: Onushkin, G.A., Young-Jin Lee, Jung-Ja Yang, Hyung-Kun Kim, Joong-Kon Son, Gil-Han Park, YongJo Park
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.01.2009; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Alternating current; Arrays; Bridge circuits; Chip formation; Chips; Circuits; DC-DC power converters; Energy consumption; Flux; Gallium compounds; High voltages; Insulation; integrated circuit design; LED lamps; Light emitting diodes; light-emitting diodes (LEDs); Power consumption; Resistors; sapphire; semiconductor device fabrication; Substrates; Voltage
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2008.2008204

The structure of a single light-emitting diode (LED) chip for operation under high voltage alternating current (ac) conditions was proposed. The chip was designed and fabricated as an integrated circuit with several isolated LED structures grown on a single insulated sapphire substrate. The efficient blue LED chip for operation directly from 220-V ac power source has been designed, fabricated, and analyzed. The white ac operated LED (ACOLED) chip demonstrates a value of averaged luminous flux ~ 320 lm and luminous efficiency 80 lm/W under operation from 220-V ac source with 4 W of power consumption. The ladder type of circuit and the efficient ACOLED chip configuration results in proficient operation under ac conditions.