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Triplet excited states quenching by molecular oxygen is widely applied in optical sensing techniques. Such oxygen sensors often show inadequate performance when measuring high concentrations of oxygen. Adjustment of quenching rates with respect to particular applications is essential to keep the accuracy and dynamic range of the method. In addition, protection of the sensor material from photochemically generated reactive singlet oxygen is required. In this chapter different approaches for controlling oxygen quenching rates and photooxidation of the phosphorescent materials in oxygen sensing applications are discussed. Passive protection, based on limiting the diffusion of oxygen diffusion to the excited states, and active protection, employing oxygen-scavenging species, are compared. The performance of different approaches and examples of applications in oxygen sensing are outlined.

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