What is an exciton?, A free electron, A bound electron-hole pair, A phonon, A crystal defect, What does a PL spectrum measure?, Electrical resistance, Emitted light intensity as a function of energy, Only absorption, Temperature, Is a lower-energy PL peak always a trion?, Yes, No, Which factor can shift a PL peak?, Strain, Temperature, Dielectric environment, All of the above, Does higher PL intensity always mean a better-quality sample?, Yes, No

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