Ca_(10)Si_(6)O_(21)Cl_(2):Dy^(3+),Eu^(3+)暖白光荧光粉的制备及发光性能研究

Preparation and Luminescent Properties of Ca_(10)Si_(6)O_(21)Cl_(2):Dy^(3+),Eu^(3+) Warm White Phosphors

以更高效率的近紫外芯片作为激发光源,激发单一基质暖白光荧光粉,在实现稳定的全光谱暖白光LED照明方面具有重要的研究意义。采用高温固相法首先制备了Ca_(10)Si_(6)O_(21)Cl_(2):Dy^(3+)荧光粉,其在发射中心分别是位于480 nm的蓝光和575 nm的黄光,在高浓度Dy^(3+)掺杂下未观察到明显的浓度猝灭现象,基于经济性考虑将Dy^(3+)的最佳掺杂浓度定为7%。其次,制备了Ca_(9.93-x)Si_(6)O_(21)Cl_(2):0.07Dy^(3+),xEu^(3+))荧光粉,并在394 nm近紫外光激发下出现480,575,594和614 nm四个较明显的发射峰,红黄蓝3种光色叠加获得暖白光。进一步研究表明,Dy^(3+),Eu^(3+)之间存在^(4)F_(9/2)→^(5)D_(0)的能量传递,所制备的Ca_(9.82)Si_(6)O_(21)Cl_(2):0.07Dy^(3+),0.11Eu^(3+)荧光粉的色坐标为(0.3761,0.3523),色温4000 K,具有潜在的应用前景。

In order to realize a stable full spectrum warm white LED lighting,it is of great significance to use a more efficient near ultraviolet chip as the excitation source to excite a single substrate warm white phosphor.In this paper,Ca_(10)Si_(6)O_(21)Cl_(2):Dy^(3+)phosphors were prepared by high temperature solid-state method.The emission of Ca_(10)Si_(6)O_(21)Cl_(2):Dy^(3+)phosphors compose of blue light at 480 nm and yellow light at 575 nm.No obvious concentration quenching phenomenon was observed under high Dy^(3+)doping concentration.Based on economic considerations,the optimal doping concentration of Dy^(3+)is selected as 7%.Continuously,the Ca_(9.93-x)Si_(6)O_(21)Cl_(2):0.07Dy^(3+),xEu^(3+)phosphors were prepared.Under the excitation of 394 nm near ultraviolet light,four obvious emission peaks at 480,575,594 and 614 nm were observed,so that warm white light can be obtained by superposition of red,yellow and blue.Further studies showe that there is a^(4)F_(9/2)→^(5)D_(0) energy transfer between Dy^(3+)and Eu^(3+),and the color coordinates of Ca_(9.82)Si_(6)O_(21)Cl_(2):0.07Dy^(3+),0.11Eu^(3+)phosphors are(0.3761,0.3523),and the color temperature is 4000 K.Therefore,it suggested that the as prepared phosphor has a potential application prospect.