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Structural dissymmetry and strong second‐harmonic generation (SHG) responses are key conditions for nonlinear optical (NLO) crystals, and targeted combinatorial screening of suitable anionic groups has become extremely effective. Herein, optimal combination of flexible SnSn (n = 5, 6) groups and highly electropositive cations (lanthanides (Ln3+) and alkaline earth (Ae2+: Sr, Ca) metals) affords the...
Multicolor photoluminescence over the full visible color spectrum is critical in many modern science and techniques, such as full‐color lighting, displays, biological and chemical monitoring, multiband communication, etc., but the ultimate white lasing especially on the nanoscale is still a challenge due to its exacting requirements in the balance of the gain and optical feedback at different wavelengths...
Barium calcium titanate (Ba1‐xCaxTiO3, BCT), which can be used as a three‐dimensional nonlinear photonic crystal, is an anomalous ferroelectric with tremendous electromechanical response. Its phase transition behavior depends closely on the Ca content. In particular, the rhombohedral‐orthorhombic and orthorhombic‐tetragonal transitions can disappear at two contents: x = 0.18 and 0.23, respectively,...
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