白光LED用K2ZnSiO4∶Sm^3＋橙红色荧光粉的制备及发光性能

Synthesis and Luminescence Properties of K_2ZnSiO_4: Sm^(3+) Reddish–Orange Phosphor for White LED

用溶胶-凝胶法合成白光LED用K2Zn Si O4:Sm3+橙红色荧光粉,研究了样品结构及发光性能。X射线衍射分析表明,微量Sm3+掺杂的样品主晶相为正交晶系结构的K2Zn Si O4。该荧光粉能被近紫外光有效激发,在403 nm激发下,发射光谱由4个发射峰组成,最强峰位于605 nm处,是由Sm3+的4G5/2→6H7/2跃迁引起的。增大Sm3+掺杂量,发光强度先增大后减小,Sm3+最佳掺杂摩尔分数为7%。随着Sm3+掺杂量的增加,样品的色坐标基本不变,位于橙红光区。

The reddish-orange emitting phosphor K2ZnSiO4：Sm^3＋, which can be used for white light-emitting diode, was synthesizedby a sol–gel method, and its phase structure and luminescent properties were investigated. Based on the X-ray diffraction data, theprincipal crystalline phase of the sample doped a small amount of Sm^3＋ is K2ZnSiO4 with orthorhombic crystal structure. TheK2ZnSiO4：Sm^3＋ phosphor can be effectively excited by a near ultraviolet source. The emission spectra are composed of four emissionpeaks under excitation at 403 nm. The most intense peak appears at 605 nm, which is ascribed to 4G5/2→6H7/2 transition of Sm^3＋. Theluminescent intensity firstly increases and then decreases with increasing the Sm^3＋ content. The optimum concentration of Sm^3＋ is 7%in mole. The commission international de L＇Eclairage chromaticity coordinates of K2ZnSiO4：Sm^3＋ locate in the reddish-orange regionand do not change as the mass fraction of Sm^3＋ increases.