兰州大学机构库 >数学与统计学院
稀土离子Dy3+掺杂的KBa2Nb5O15白色LED荧光粉发光性能的研究
Alternative Titleluminescence properties of Novel Dy3+-doped KBa2Nb5O15 white light phosphors for LED
丁鑫
Thesis Advisor王育华
2013-05-06
Degree Grantor兰州大学
Place of Conferral兰州
Degree Name学士
KeywordLED 荧光粉 KBa2Nb5O15:Dy3+
AbstractLED(Light Emitting Diode)是一种场致发射光源,是能够将电能直接转化成光能的器件。L E D 的发光原理是在P — N 结两端加上正向电压,则P 区中的空穴会流向N 区; N 区中的电子会流向P 区。然后,随着少数载流子和多数载流子的复合放出能量。其中,少部分能量转化为热能,大部分能量转化为光能,发光效率可以达到8 0 % ~ 9 0 %。目前,实现白光LED最成熟的方式是荧光粉转换法,而荧光粉的发光性能极大程度上影响着白光发光二极管的性能。因此获得发光性能优异和化学性质稳定的荧光粉成为实现白光LED的关键。    白色荧光粉末KBa2Nb5O15: Dy3+通过高温固相法合成得到。经过X射线衍射手段测试发现,所得到的样品均是单相。样品在380 nm到400 nm之间有很强的激发光谱,适合于近紫外LED芯片。在388 nm的紫外光激发下,可以得到属于Dy3+的4F9/2-6H15/2 a和4F9/2-6H13/2能级跃迁。分别在477 nm(蓝光)和572 nm(黄光)。当Dy3+在最佳掺杂浓度时3%,可以得到色坐标为(0.395,0.422)的点,色温也处在较低的温度3925k。结果显示,KBa2Nb5O15: Dy3+荧光粉可以作为潜在的白光LED替代者。
Other AbstractLED is a kind of light sources of electroluminescent. It can convert electrical energy into light energy. The luminescence mechanism of LED is that when adding positive voltage on p-n junction, the hole in P region will transfer to N region and the electron in N region will transfer to P region. The energy will be produced When the hole and the electron recombine with each other.Most of the energy will be transformed into light energy. The efficiency can be reached to 80%-90%. At the present time, the most full-blown method of getting white-LED is the transformation of fluorescent powders. In addition, the performance of the fluorescent powders influence the properties of LED profoundly. Consequently, getting high performance fluorescent powders is very important. The white light emission phosphor KBa2Nb5O15: Dy3+ was synthesized by solid-state method. X-ray diffraction (XRD) study reveals that all the Dy3+ doped phosphors are single phase. Strong excitation peaks of KBa2Nb5O15: Dy3+ were found around 380 to 400 nm, matched well with the NUV LED chips. Under 388 nm excitation, the phosphor exhibited intense white emission by combining the two emission peaks at 477 nm and 572 nm, attributed to the characteristic 4F9/2-6H15/2 and 4F9/2-6H13/2 transition of Dy3+. The optimum doping concentration of Dy3+ found to be 3%, whose Commission International de l' Eclairage (CIE) chromaticity coordinates and correlated color temperature are (0.395, 0.422) and 3925 k, respectively. The results indicate that the KBa2Nb5O15: Dy3+ phosphor could be considered as a potential candidate for white-LEDs.
URL查看原文
Language中文
Document Type学位论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/224581
Collection数学与统计学院
Recommended Citation
GB/T 7714
丁鑫. 稀土离子Dy3+掺杂的KBa2Nb5O15白色LED荧光粉发光性能的研究[D]. 兰州. 兰州大学,2013.
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