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Radiative efficiency of light-emitting materials

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. Outline. Motivation

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Radiative efficiency of light-emitting materials

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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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