KLa(MoO_4)_2∶Yb^(3+),Ho^(3+),Tm^(3+)白光荧光粉的制备及性能研究

Preparation and Properties of KLa(MoO_4)_2∶Yb^(3+),Ho^(3+),Tm^(3+)White Phosphors

采用水热法成功制备了Yb^(3+),Ho^(3+),Tm^(3+)三掺的多晶KLa(Mo O4)2荧光粉。在980 nm激光激发下,KLa(MoO_4)_2∶Yb^(3+),Ho^(3+),Tm^(3+)发出裸眼可见的明亮白光,这其中包括Tm^(3+)离子发出的蓝光(~475 nm)、Ho^(3+)离子发出的绿光(~540 nm)和红光(~651 nm)。根据色度坐标系计算得出的坐标点可以看出,随着Ho^(3+)/Tm^(3+)掺杂浓度之比的增加,KLa(Mo O_4)_2∶Yb^(3+),Ho^(3+),Tm^(3+)所发出的白光呈现从冷白光到暖白光的变化。最后详细讨论了KLa(Mo O_4)_2∶Yb^(3+),Ho^(3+),Tm^(3+)荧光粉可能的发光机制。

The polycrystalline KLa（MoO4）2∶Yb^3＋,Ho^3＋,Tm^3＋phosphors were synthesized by the simple hydrothermal method. Under the excitation of 980 nm laser,KLa（MoO4）2∶Yb^3＋,Ho^3＋,Tm^3＋phosphors show bright white upconversion emission visible to the naked eyes,which composes of blue emission at - 475 nm from Tm^3＋,green and red emission at - 540 nm and - 651 nm from Ho^3＋. The experiment results show that the coordinates of KLa（MoO4）2∶Yb^3＋,Ho^3＋,Tm^3＋in the commission international CIE chromaticity diagram can be controlled from cool to warm white color depending on the rate of Ho^3＋/Tm^3＋concentrations.