Sun Tongqing, Zhang Yu, Shan Pai, Zhang Zichang, Chen Shaolin, Kong Yongfa, Xu Jingjun
The MOE Key Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin, People's Republic of China; School of Physics, Nankai University, Tianjin, People's Republic of China.
School of Physics, Nankai University, Tianjin, People's Republic of China.
PLoS One. 2014 Jun 26;9(6):e100922. doi: 10.1371/journal.pone.0100922. eCollection 2014.
A single crystal of Nd3+-doped KGdP4O12 was successfully grown with the top-seeded solution growth and slow cooling (TSSG-SC) technique. It crystallizes in space group C2/c with cell parameters a = 7.812(2) Å, b = 12.307(3) Å, c = 10.474(2) Å, β = 110.84(3)° and Z = 4. The IR and Raman spectra also indicated that the phosphoric polyhedra of Nd:KGdP4O12 has a cyclic symmetry. The chemical composition of the crystal was analyzed and the distribution coefficient of Nd3+ was calculated. The crystal morphology of KGdP4O12 was identified using X-ray diffraction. The compound has good thermal stability to 920°C. Its specific heat and thermal conductivity were determined for potential applications. The spectral properties of Nd:KGdP4O12 indicates that it exhibits broad absorption and emission bands, which are attributed to low symmetry of the crystal. The broad absorption band around 798 nm has a full-width at half-maximum (FWHM) of 14.8 nm and is suitable for AlGaAs laser diode pumping. Moreover, 5 at% Nd3+-doped KGdP4O12 crystal has a long luminescence lifetime of 300 μs and a high quantum efficiency of 96%.
采用顶部籽晶溶液生长法和缓慢冷却法（TSSG-SC）成功生长出了掺Nd³⁺的KGdP₄O₁₂单晶。它属于空间群C2/c，晶胞参数为a = 7.812(2) Å，b = 12.307(3) Å，c = 10.474(2) Å，β = 110.84(3)°，Z = 4。红外光谱和拉曼光谱也表明，Nd:KGdP₄O₁₂的磷多面体具有环状对称性。对晶体的化学成分进行了分析，并计算了Nd³⁺的分布系数。利用X射线衍射确定了KGdP₄O₁₂的晶体形态。该化合物在920°C时具有良好的热稳定性。测定了其比热容和热导率以用于潜在应用。Nd:KGdP₄O₁₂的光谱特性表明它表现出宽吸收带和发射带，这归因于晶体的低对称性。798 nm附近的宽吸收带半高宽（FWHM）为14.8 nm，适合于AlGaAs激光二极管泵浦。此外，掺5 at% Nd³⁺的KGdP₄O₁₂晶体具有300 μs的长发光寿命和96%的高量子效率。
