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Enhancing Radiative Efficiency of Light-Emitting Materials: A Study on InGaAs System

Dive into a talk from the SPIE Regional Meeting, discussing the radiative efficiency of InGaAs materials. Explore motivations for improving LED and laser diode performance, experimental techniques, efficiency measurements, defects like Auger, and conclusions regarding recombination and lattice mismatch.

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Enhancing Radiative Efficiency of Light-Emitting Materials: A Study on InGaAs System

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  1. A talk given at the SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging (2000) Radiative efficiency of light-emitting materials Tim Gfroerer Davidson College, Davidson, NC - Funded by Research Corporation and the Petroleum Research Fund

  2. Outline • Motivation • Experimental technique • Material system: InGaAs • Conclusion

  3. Motivation light-emitting diodes laser diodes • light is good! • heat is bad!

  4. Motivation (continued) internal reflection scattering refraction reabsorption collection efficiency = ?

  5. Measuring the efficiency efficiency = light in / light out DT a heat heat light in signal a light out light in =heat+ light out

  6. Experimental set-up - heat light in light out

  7. Efficiency calibration excitation g light + heat increasing excitation

  8. Calibrated efficiency light defects Auger

  9. Nonradiative mechanisms defects: Auger:

  10. GaInAs bandgap GaAs InP substrate Ga0.5 In0.5 As InAs

  11. Lattice mismatch misfit dislocations and strain

  12. Auger activation energy Conduction band smaller bandgap: smaller Ea Ea momentum Valence band

  13. Conclusions • New radiative efficiency measurement technique • Material system: InGaAs • Recombination and Lattice mismatch

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