为了研究稀土掺杂单一基质白光荧光粉,以三聚氰胺为原料,通过热分解法制备g-C3N4蓝色荧光粉;采用化学共沉淀法制备了 KYF∶E(KY085F4∶0.15Eu3+)红色荧光粉,运用沉淀吸附反应制备复合荧光粉KYF∶E-CN(KY0.85F4∶0.15Eu3+@0.014g-C3N4).利用X射线衍射、红外光谱、荧光光谱分析对荧光粉进行表征.探究了 Eu3+和g-C3N4用量对荧光粉发光性能的影响.结果表明,KYF∶E和KYF∶E-CN的XRD衍射峰与NaYF4标准卡PDF#06-0342的衍射峰基本相匹配,为面心立方晶系结构.KYF∶E-CN的红外光谱显示KYF∶E和g-C3N4的特征吸收峰,说明g-C3N4已经掺入KYF∶E的晶格中.在393 nm的紫外光激发下,Eu3+用量为15%时,红色荧光粉KYF∶E的发光强度最大.改变g-C3N4的用量,KYF∶E-CN复合荧光粉的发光可实现由红光到蓝光的转变,在g-C3N4用量为1.4%时,KYF∶E-CN荧光粉色坐标为(0.27,0.23),发光接近白光,在白光LED中具有潜在的应用前景.
In order to obtain a single matrix white light phosphor,taking melamine as raw material,g-C3N4 blue phosphor was prepared by thermal decomposition method.KYF∶E(KYF4∶0.15Eu3+)red phosphor was prepared by using the chemical coprecipitation metod,the composite phosphorKYF∶E-CN(KYF4∶0.15Eu3+@0.014g-C3N4)was prepared by precipitation adsorption reaction.The phosphors werecharacterized by the powder X-ray diffraction(XRD),infrared spectrum(IR),fluorescence spectrum analysis.The effects of Eu3+,g-C3N4 on luminescence properties of phosphors were investigated.The XRD diffraction peak of KYF∶E and KYF∶E-CNmatched that of NaYF4 standard card PDF#06-0342,it was a square crystal structure.IR spectra of KYF∶E-CNshowed the characteristic absorption peaks of KYF∶E and g-C3N4,indicating that g-C3N4 was successfully doped in KYF∶Efluorescence samples.Under the excitation of UV at 393 nm,when Eu3+dosage was15%,thered phorphorKYF:Ehad the highest luminous intensity.Changing the dosage of g-C3N4,the composite phosphors of KYF∶E-CNwere transformed from red light to blue light.When the dosageof g-C3N4 was1.4%,the chromaticity coordinates of phosphor of KYF∶E-CNwere(0.27,0.23),the luminescence was close to white light,having a potential application in white LED.