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Spectral performance and intensive green upconversion luminescence in Er/Yb-codoped NaY(WO4)2 crystal |
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| Authors: | Feng Song Lin Han Hao Tan Jing Su Jia Yang Jian-guo Tian Guang-yin Zhang Zhen-xiang Cheng |
| Institution: | a Photonics Center, College of Physics Sciences, Nankai University, Tianjin 300071, PR China b The Key Laboratory of Advanced Technique and Fabrication for Weak-Light Nonlinear Photonics Materials, Ministry of Education, Nankai University, Tianjin 300457, PR China c Institute of Crystal, Shandong University, Shandong Province, Jinan 250100, PR China |
| Abstract: | Using Czochralski (CZ) pulling method, an Er3+/Yb3+-codoped NaY(WO4)2 crystal was prepared. Absorption spectra, emission spectra and excitation spectra of this crystal were measured at room temperature. Some optical parameters, such as intensity parameters, spontaneous emission probabilities and lifetimes, were calculated from absorption spectra with Judd-Ofelt (J-O) theory. Upconversion luminescence excited by a 970 nm diode laser was studied. In this crystal, green upconversion luminescence is particularly intensive. Energy transfer mechanisms that play an important role in upconversion processes were analyzed. Two cross-relaxation processes: 4G11/2 + 4I9/2 → 2H11/2 (or 4S3/2) + 2H11/2 (or 4S3/2), and 4G11/2 + 4I15/2 → 2H11/2 (or 4S3/2) + 2I13/2, which contribute to the intensive green luminescence under 378 nm excitation, were put forward. Background energy transfer 4G11/2(Er3+) + 2F7/2(Yb3+) → 4F9/2(Er3+) + 2F5/2(Yb3+) was also demonstrated. |
| Keywords: | 42 70 Hj 78 55&minus m |
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