Light emitting diode arrays for HWIL sensor testing

We report here the light emission from IR interband-cascade (IC) Type-II-super lattice LED structures. We employed two different IC epitaxial structures for the LED experiments consisting of 9 or 18 periods of active super lattice gain regions separated by multilayer injection regions. The light output (and the voltage drop) of the LEDs is observed to increase with increase of number of IC active regions in the device. The voltage drop decreases with increase of mesa size and light emission increases with mesa sizes. We have made 8x7 2-D LED array flip-chip bonded to fan out array. The black body emissive temperature is 650 and 1050 K for LED operation at room and liquid nitrogen temperature respectively. A comparison of different IR sources for scene generation is presented.

[1]  Eli Yablonovitch,et al.  Ultrahigh spontaneous emission quantum efficiency, 99.7% internally and 72% externally, from AlGaAs/GaAs/AlGaAs double heterostructures , 1993 .

[2]  Lawrence E. Jones,et al.  Characterization measurements of the wideband infrared scene projector resistor array , 1996, Defense, Security, and Sensing.

[3]  Robert Lee Murrer,et al.  Large-area infrared microemitter arrays for dynamic scene projection , 1998, Defense, Security, and Sensing.

[4]  Daniel A. Saylor,et al.  Dynamic IR scene projector based upon the digital micromirror device , 2001, SPIE Defense + Commercial Sensing.

[5]  Gustaaf Borghs,et al.  Light-emitting diodes with 31% external quantum efficiency by outcoupling of lateral waveguide modes , 1999 .

[6]  John L. Bradshaw,et al.  Interband cascade lasers: progress and outlook , 2004, SPIE Security + Defence.

[7]  Owen M. Williams,et al.  Thermal comparison of emissive infrared projector devices , 1993, Defense, Security, and Sensing.

[8]  James A. Buford,et al.  Overview of dynamic scene projectors at the U.S. Army Aviation and Missile Command , 2002, SPIE Defense + Commercial Sensing.

[9]  Eric M. Olson,et al.  Innovations in IR projector arrays , 2000, Defense, Security, and Sensing.

[10]  Naresh C. Das,et al.  Design and fabrication of 2xD light emitting device arrays for IR scene projection , 2004, SPIE Defense + Commercial Sensing.

[11]  Ronald G. Driggers,et al.  Review of infrared scene projector technology-1993 , 1994 .

[12]  Daniel A. Saylor,et al.  Current status of the laser diode array projector technology , 1998, Defense, Security, and Sensing.

[13]  T. S. Tan,et al.  High-power truncated-inverted-pyramid (AlxGa1−x)0.5In0.5P/GaP light-emitting diodes exhibiting >50% external quantum efficiency , 1999 .

[14]  Rui Q. Yang,et al.  Mid-infrared type-II interband cascade lasers , 2002 .

[15]  A. Scherer,et al.  30% external quantum efficiency from surface textured, thin‐film light‐emitting diodes , 1993 .