Principles of CPL Measurement Systems and Advances in Measurement Methods

Circularly polarized luminescence (CPL) measurement systems are used to evaluate the CPL properties of synthesized compounds in the solution or solid state and, more recently, CPL-emitting devices for display applications. In order to obtain appropriate signals, it is important to understand both the CPL measurement principles and the instrument configuration. Therefore, this chapter describes the instrument configuration and the role of each component, and details about the propagation of light from a light source through a sample to produce the final CPL signal. When measuring solid samples, it is necessary to verify that the sample has no optical anisotropy in order to obtain the correct CPL signal based only on the sample, except when a special CPL spectrometer is used. In this chapter, measurement methods and points to note for solid samples are described, and measurement examples for solids such as pellets and powder are given.