LIGHT-EMITTING DIODE-ARRAYS FOR CONSUMER AND MEDICAL APPLICATIONS

Development of light emitting diodes (LEDs) and arrays of diodes to be utilized in a modern and highly sensitive spectrophotometer is presen ted. The In1-xGaxAs1-yPy quaternary alloy semiconductor has been utili zed in the design and fabrication of surface emitting infrared LEDs in the spectral range from 1100 to 1650 nm. Custom made chips provide th e surface-emitting LEDs with high radiance and superior far-field patt erns. The hybrid 31-element array of LEDs was fabricated. A temperatur e sensor and a photodiode was incorporated on the hybrid circuit to co ntrol the temperature and light intensity of the diodes. The instrumen t prototype has been fabricated and preliminary experimental data have been collected. (C) 1998 Elsevier Science S.A. All rights reserved.