This Review article focuses on all kinds ofluminescent probes and sensors for measurement of T, and summarizesthe recent progress in their design and application formats. The introductioncovers the importance of optical probes forT, the origin of theirT-dependentspectra, and the various detection modes. This is followed by a survey on (a) molecular probes, (b) nanomaterials, and (c) bulk materials for sensingT. This section will be completed by a discussion of (d) polymeric matrices forimmobilizingT-sensitive probes and (e) an overview of the variousapplication formats ofT-sensors. The review ends with a discussion onthe prospects, challenges, and new directions in the design of opticalT-sensitiveprobes and sensors.