Influence of phase transitions on green fluorescence intensity ratio in Er3+ doped K5.0Na0.5NbO3 ceramic

Zhang Liang, Enwei Sun, Shenghai Pei, Leipeng Li, Feng Qin, Yangdong Zheng, Hua Zhao, Zhiguo Zhang, Wenwu Cao

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12 Scopus citations


The fluorescence intensity ratio (FIR) method is a non-contact temperature (T) measurement technique based on thermally coupled levels of rare earth ions in a doped host. Green fluorescence originating from 2H11/2 and 4S3/2 states of Er3+ doped K0.5Na0.5NbO3 (KNN) ceramic are studied in the temperature range of 300 K to 720 K. The fluorescence intensities change dramatically around phase transition points where the crystal symmetry changes, inducing deviation of the FIR from Boltzmann's law. The temperature determined by the FIR method deviates from thermocouple measurements by 7 K at the orthorhombic to tetragonal phase transition (TO-T) point and 13 K at the Curie point (TC). This finding gives guidance for developing fluorescent T sensors with ferroelectrics and may also provide a fluorescent method to detect phase transitions in ferroelectric materials.

Original languageEnglish (US)
Pages (from-to)29209-29215
Number of pages7
JournalOptics Express
Issue number25
StatePublished - Dec 12 2016

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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