ABSTRACT
This chapter examines three spectroscopic techniques for measuring the atomic or electronic energy transitions involved in (1) absorbing and emitting light, (2) the efciency of absorbing or emitting light, (3) mechanisms of energy transfer, and (4) characterization of absorption by a nonoptical detection technique, namely, measuring the concentration of photo-generated electronic carriers. The three techniques we consider in this chapter-Photoluminescence (PL), Photoluminescence Excitation Spectroscopy (PLE), and Photocurrent Spectroscopy (PC)—are measured under continuous wavelength (CW) excitation, i.e., steady-state illumination by an optical power source (time-resolved PL is discussed in Chapter 12).
