采用水热法合成掺杂过渡金属离子Mn2+和Cr3+的NaGdF4∶ Yb3+,Ho3+纳米晶,研究了纳米晶的结构和上转换发光性能.XRD研究结果表明:所有的样品均为六方结构NaGdF4.合成的纳米晶在980 nm红外光激发下,呈现绿光(520～562 nm),红光(620 ～ 675 nm)和红外光(730～ 760 nm)发射.与未掺杂过渡金属离子的样品相比,掺杂Mn2离子的NaGdF4∶Yb3+,Ho3+纳米晶上转换发光总效率提高,红光/绿光相对强度增加,红外光/绿光相对强度减弱,掺杂Cr3+离子的NaGdF4∶Yb3+,Ho3+纳米晶发光总效率稍有减弱,红光/绿光和红外光/绿光相对强度增加.主要源于Ho3+→Mn2+→Ho3+和Ho3+→Cr3+→Ho3+的两步能量传递.计算色坐标可得,掺杂Cr3+/Mn2+离子后的NaGdF4∶Tb3+,Ho3纳米晶的发光由绿光区移向黄光区,微调了纳米晶体的发光颜色.
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