SETI Demonstrates Deep UV AlInGaN LEDs for space qualification
Nov 25, 2010 Jointly with Stanford University and National Security Technologies (NSTec) of Livermore, California, Sensor Electronic Technology Inc. (SETI), has demonstrated deep ultraviolet AlInGaN LEDs set to rocket.
SETI's UVTOP LEDs are a series of UV and deep-UV LEDs with peak emission wavelengths in the range of 240 - 400 nm. They incorporate AlInGaN deposited by a proprietary Migration Enhanced MOCVD process.
With peak emission wavelength of 255 nm, Deep UV LEDs have passed extreme space qualifications for large temperature variations and mechanical shocks with 27 cycles of 100K temperature cycles and 14g rms random mechanical vibrations.So far, UV LEDs have have exhibited high operational lifetimes in excess of 26,000 hours in nitrogen atmosphere, and 25,000 hours in vacuum, without significant power drop or spectral shift.
The UVTOP LEDs have been successfully tested against the requirements for deep space exploration such as the Europa Jupiter System Mission (EJSM), where they will be subject not only to severe thermal and mechanical shocks, but also high levels of radiation. Under irradiation up to 2x1012 protons/cm2, the LEDs demonstrated extreme radiation hardness.
As a result, this UVTOP LEDs is suitable for many space and terrestrial applications.
In addition, SETI also produced Solar-blind P-i-N photodiodes with a peak responsivity matching the UVTOP LEDs at 255 nm, and they was tested to the same stringent space qualifications. These detectors also exhibited extreme radiation hardness and retained 50% responsivity up to 3x1012 protons/cm2 fluence.
Author: BIO T&T
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