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由于固体化和集成化的成就,使电子设备、测试仪器可靠性显著地提高,从而对指示光源提出了固体化的要求。为此,我们研制了α—NaYF_4:Yb,Er上转换磷光体,它与GaAs掺Si红外发光二极管匹配,可以制成适合于多种应用的绿色固体灯。一、实验方法用Na_2SiF_6和共沉淀的Y_(1-y-z)Yb_yEr_zF_3在10~(-2)乇低真空条件下脱水,在Ar气氛中灼烧的方法制备α—NaYF_4:Yb,Er上转换磷光体,其反应式如下: 2Y_(1-y-z)Yb_yEr_zF_3+Na_2SiF6 630℃ Ar气氛 2NaY_(1-y-z)Yb_yEr_zF_4+SiF_4↓制备过程大致分为如下三步:
Due to the solidification and integration achievements, the reliability of electronic equipment and test equipment has been significantly improved, and solidification requirements have been put forward on the indicator light source. To this end, we have developed a-NaYF_4: Yb, Er upconversion phosphors that match GaAs-doped Si infrared LEDs to make green solid-state lamps suitable for many applications. First, the experimental methods Na_2SiF_6 and coprecipitated Y_ (1-yz) Yb_yEr_zF_3 under 10 ~ (-2) Torr dehydration under low vacuum conditions, burning in the Ar atmosphere prepared α-NaYF_4: Yb, Er upconversion phosphorescence The reaction equation is as follows: 2Y_ (1-yz) Yb_yEr_zF_3 + Na_2SiF6 630 ℃ Ar atmosphere 2NaY_ (1-yz) Yb_yEr_zF_4 + SiF_4 ↓ The preparation process is roughly divided into the following three steps: