Lu2.94Al5O12:0.06Ce3+绿色荧光粉的制备及光致发光

采用高温固相法制备了Lu_2.94Al₅O₁₂:0.06Ce³⁺绿色荧光粉。通过X射线粉末衍射(XRD)、扫描电子显微镜(SEM)和光致发光光谱(PL)对样品的物相、形貌及发光性能进行了表征。结果表明,所合成的Lu_2.94Al₅O₁₂:0.06Ce³⁺绿色荧光粉为立方晶系,表面为类球形。激发光谱中,位于340和450 nm的激发峰分别归属于4f的两个能级到5d能级的跃迁而产生的吸收,340 nm处的激发峰是由于发光是由于²F_5/2到5d的跃迁,而450nm处的激发峰是由于²F_7/2到5d的跃迁。发射光谱中,位于525 nm的发射峰对应Ce³⁺的4f-5d电子跃迁。当Ce₃₊掺杂量为6%,1500℃煅烧5 h时,Lu_2.94Al₅O₁₂:0.06Ce³⁺绿色荧光粉CIE色坐标为(0.3683,0.5959),是一种可以用作白光LED的绿色荧光粉。

Preparation and photoluminescent property of Lu2.94Al5O12:0.06Ce3+ green phosphors

Lu_2.94Al₅O₁₂:0.06Ce³⁺green phosphors are prepared by high temperature solid phase method.The phase,morphology and luminescence properties of the samples are characterized by powder X-ray diffraction(XRD),scanning electron microscopy(SEM)and photoluminescence spectroscopy(PL).The results show that the synthesized Lu_2.94Al₅O₁₂:0.06Ce³⁺green phosphor is cubic and the surface is spherical.The excitation peak and emission peaks are attributed to the green light with wavelength of 450 nm and 525 nm,respectively,which corresponds to 5d→4f transition emission characteristics of Ce³⁺.When Ce³⁺has a doping ratio of 6%and is calcined at 1500℃for 5 h,Lu_2.94Al₅O₁₂:0.06Ce³⁺green phosphor has a CIE color coordinate of(0.3683,0.5959)which is a kind of high-efficiency green phosphor expected to be used in white LED.