{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,7]],"date-time":"2026-02-07T12:23:20Z","timestamp":1770467000801,"version":"3.49.0"},"reference-count":31,"publisher":"IntechOpen","isbn-type":[{"value":"9780854668939","type":"print"},{"value":"9780854668922","type":"electronic"}],"license":[{"start":{"date-parts":[[2024,7,22]],"date-time":"2024-07-22T00:00:00Z","timestamp":1721606400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/legalcode"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>This chapter provides a comprehensive exploration of optical fluorescence intensity ratio (FIR) temperature sensing, blending theoretical underpinnings with practical applications. It underscores the intrinsic sensitivity and non-invasiveness of FIR technology, spanning diverse scientific disciplines where its utility is paramount. Central to the discussion are the intricate energy transfer mechanisms within fluorescence emissions from temperature-sensitive materials, revealing their nuanced responses to thermal changes. Fundamental to FIR thermometry are the lanthanide (Ln3+) ions, which play pivotal roles due to their unique electronic configurations. These elements exhibit temperature-dependent variations in fluorescence properties, including intensity and lifetime, crucial for accurate temperature determination. Specifically, the chapter delves into the utilization of erbium (Er3+) and holmium (Ho3+) ions in the context of FIR thermometry, highlighting their distinct contributions to enhancing temperature sensitivity. The Er3+\/Ho3+ co-doped nano-garnet emerges as a promising material in this field, effectively bridging theoretical frameworks with practical implementations. The narrative is enriched by the incorporation of the Boltzmann distribution equation, which provides a robust theoretical foundation for understanding temperature-dependent fluorescence phenomena exhibited by Ln3+ ions. This chapter serves as a valuable resource, offering a concise understanding on the forefront of optical FIR-based thermometry for researchers and professionals alike.<\/jats:p>","DOI":"10.5772\/intechopen.1005917","type":"book-chapter","created":{"date-parts":[[2024,7,23]],"date-time":"2024-07-23T09:54:46Z","timestamp":1721728486000},"source":"Crossref","is-referenced-by-count":1,"title":["Fundamental Concerns of Optical Fluorescence Intensity Ratio-Based Thermometry"],"prefix":"10.5772","author":[{"given":"Helena","family":"Cristina Vasconcelos","sequence":"first","affiliation":[]}],"member":"3774","published-online":{"date-parts":[[2024,7,22]]},"reference":[{"key":"ref=1","unstructured":"McGee TD. Principles and Methods of Temperature Measurement. New York: John Wiley and Sons, Inc.; 1988"},{"key":"ref=2","doi-asserted-by":"crossref","unstructured":"Soulen RJ. A brief history of the development of temperature scales: The contributions of Fahrenheit and Kelvin. 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