CAJ | 학술논문

荧光粉转化法是目前制备白光 LED 的主流技术.但是商业化的荧光粉由于缺少红色部分或红色不稳定,使得制备出的 LED 灯泡颜色偏冷,因此研制低成本、性能稳定的红色荧光粉具有重要的意义.本项目以化学性质稳定、合成工艺温和的硼酸盐 KZn4(BO3)3为基质,掺杂稀土离子来研究荧光粉的发光性能.通过高温固相法合成了一系列不同掺杂浓度的 KZn4(BO3)3∶Eu3＋,并测试了 XRD 衍射图谱,发射和激发光谱.研究表明 Eu3＋离子倾向于占据 Zn2＋格位.同时,KZn4(BO3)3∶Eu3＋的最佳激发波长(393 nm)位于近紫外波段,适于用近紫外 LED 芯片激发来制备 LED.KZn4(BO3)3∶Eu3＋的最强发射峰位于590 nm,属于5 D0-7 F1跃迁.当发生浓度猝灭时,Eu3＋-Eu3＋离子间的临界距离为3 nm.该荧光粉的色坐标为(0.6297,0.3699),色饱和较高.该物质是一种潜在的可被用于 LED 照明用的红色荧光粉.
형광분전화법시목전제비백광 LED 적주류기술.단시상업화적형광분유우결소홍색부분혹홍색불은정,사득제비출적 LED 등포안색편랭,인차연제저성본、성능은정적홍색형광분구유중요적의의.본항목이화학성질은정、합성공예온화적붕산염 KZn4(BO3)3위기질,참잡희토리자래연구형광분적발광성능.통과고온고상법합성료일계렬불동참잡농도적 KZn4(BO3)3∶Eu3＋,병측시료 XRD 연사도보,발사화격발광보.연구표명 Eu3＋리자경향우점거 Zn2＋격위.동시,KZn4(BO3)3∶Eu3＋적최가격발파장(393 nm)위우근자외파단,괄우용근자외 LED 심편격발래제비 LED.KZn4(BO3)3∶Eu3＋적최강발사봉위우590 nm,속우5 D0-7 F1약천.당발생농도졸멸시,Eu3＋-Eu3＋리자간적림계거리위3 nm.해형광분적색좌표위(0.6297,0.3699),색포화교고.해물질시일충잠재적가피용우 LED 조명용적홍색형광분.
Phosphor transformation is the main method of producing white-light LEDs.However, most phosphors in the market are lack of red component or color stability,because most commercial LEDs produce cool white light.Thus it is realistic to search for new red phosphors with high stability and low cost.In this regard,borates,chemical stable and easily productive,have attracted our atten-tion.The structure and photoluminescence properties of KZn4 (BO3 )3 doped with Eu3 + are analyzed. We have synthesized a series of KZn4 (BO3 )3 ∶Eu3 + with different doping concentration by solid state reactions.From the X-ray diffraction data,it is concluded that Eu3 + ions are inclined to occupy Zn2 +site in the structure of KZn4 (BO3 )3 .And the PLE indicates that the best exciting wavelength (393 nm)of KZn4 (BO3 )3 ∶Eu3 + is near ultraviolet,which makes it suitable for near-UV LEDs.According to the PL,the strongest peak locates at 590 nm which is ascribed to the transition of 5 D0 -7 F1 .In addition,the quenching concentration of Eu3 + is about 1.5%,and the critical distance is about 3 nm. Finally,the CIE coordinates of KZn4 (BO3 )3 ∶ Eu3 + is (0.629 7,0.369 9 ),which has high color saturation.The material is a potential red phosphor used for LEDs.