Two pure mixed alkali/alkaline earth metal borates with three-dimensional framework, LiBaB 9 O 15 and NaBaB 9 O 15 , have been synthesized by high-temperature solid state reaction, and characterized by XRD, FT-IR, DTA–TG techniques and chemical analysis. The molar enthalpies of solution of LiBaB 9 O 15 and NaBaB 9 O 15 in 1 mol L −1 HCl(aq), and of LiCl·H 2 O(s)/NaCl(s) in [1 mol L −1 HCl + H 3 BO 3 + Ba(OH) 2 ·8H 2 O](aq) have been determined by microcalorimeter at 298.15 K, respectively. From these data and with the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol L −1 HCl (aq), together with the use of the standard molar enthalpies of formation for Ba(OH) 2 ·8H 2 O(s), LiCl·H 2 O(s)/NaCl(s), H 3 BO 3 (s), HCl(aq) and H 2 O(l), the standard molar enthalpies of formation of −(6796.8 ± 7.3) kJ mol −1 for LiBaB 9 O 15 and −(6829.9 ± 7.3) kJ mol −1 for NaBaB 9 O 15 were obtained on the basis of the appropriate thermochemical cycles.
Ting Li,Zhijun Wang,Panlai Li,Shuchao Xu,Qiongyu Bai,Zhiping Yang
A novel tunable red emitting phosphor LiBaB 9 O 15 :Sm 2+ /Sm 3+ , Li + with broad excitation band was synthesized by a high temperature solid-state method. Luminescence properties were investigated in detail by luminescence, X-ray photoelectron spectroscopy (XPS) spectra and CIE chromaticity coordinates. XPS data confirmed that there were Sm 3+ in LiBaB 9 O 15 :Sm 3+ and Sm 2+ /Sm 3+ in LiBaB 9 O 15 :Sm 2+ /Sm 3+ , respectively. Spectral property of LiBaB 9 O 15 :Sm 3+ , LiBaB 9 O 15 :Sm 3+ /Sm 2+ and LiBaB 9 O 15 :Sm 2+ , Li + presented that the excitation band of Sm 3+ widened and the excitation band of Sm 2+ ranged from 350 to 450 nm. And the red light color is tunable with changing Li + concentration. The results indicated that LiBaB 9 O 15 :Sm 2+ /Sm 3+ , Li + may be promising red phosphor for white light emitting diodes.
危险品化学品经营许可证（带存储）