摘要
白光LED是指稀土掺杂的荧光粉被蓝光芯片或紫外芯片激发后获得各种室温发白光的器件。该种光致发光的实现方式是一种新型全固态照明光源,具有节能、环保及绿色照明等优点,被誉为第四代照明光源。对于现代设施农业,480~500nm之间的蓝光有一种调整植物节律的作用,对植物生长是有益的。蓝光在绿色植物的光合作用和光形态中起着重要的作用,绿色植物通过叶绿素、胡萝卜素、叶黄素和光敏素来捕获太阳光进行光合作用,适合植物生长的LED灯可提高光合作用效率,但传统的光源由于光质问题难以调节光波长,在这种情况下,需要将太阳光谱成分中380 nm以下的紫外光转换成蓝光,可提高作物光能利用率。所以,高光效、高热稳定性蓝色荧光粉已成为全光谱照明、光生态农业等领域的重要材料。蓝色荧光材料在近紫外(NUV)芯片激发的白光用发光二极管(W-LED)的制造中起重要作用。采用高温固相法制备YVO_(4)∶Tm^(3+)蓝色荧光粉,通过X射线衍射仪、扫描电子显微镜、荧光光谱仪等检测手段对样品的物相结构、表观形貌及发光性能进行表征分析。结果表明:通过高温固相法1100℃下煅烧2 h可以制备出YVO_(4)∶Tm^(3+)蓝色荧光粉,粉体呈2μm左右的球形,激发峰位于319 nm紫外区域,发射峰位于479 nm蓝光区域,样品色坐标位于(0.1044,0.1224),是一种有望应用于白光LED的蓝色荧光粉。
White LEDs emit white light at room temperature after the rare-earth-doped fluorescent powder is excited by blue light chips or ultraviolet chips.The realization of the photoluminescence phenomenon develops a new type of all-solid-state lighting source that is lauded as the fourth-generation lighting source due to its energy-saving,environmental protection,and green lighting advantages.For modern-facility agriculture,blue light between 480 and 500 nm regulates plant rhythm,which is beneficial to plant growth.Blue light plays an important role in the light form and green plant photosynthesis.Green plants capture sunlight for photosynthesis by chlorophyll,carotenoids,lutein,and phytochrome,and LED lights suitable for plant growth can improve the efficiency of photosynthesis.However,it is difficult for traditional light sources to adjust the wavelength of light due to their light quality.In this case,ultraviolet light below 380 nm in the solar spectrum needs to be converted into blue light to improve crops’light efficiency.Therefore,blue phosphor,with high light efficiency and high thermal stability,has become an important material in full-spectrum lighting and photobiological agriculture.Blue fluorescent materials play an important role in manufacturing white light-emitting diodes(W-LEDs)excited by near-ultraviolet(NUV)chips.This paper uses a high-temperature solid-phase method to prepare YVO_(4)∶Tm^(3+)blue phosphor.X-ray diffractometer,scanning electron microscope,fluorescence spectrometer and other detection methods are used to characterize and analyze the samples’phase structure,apparent morphology and luminescence properties.The results show that YVO_(4)∶Tm^(3+)blue phosphor can be prepared by high-temperature solid-phase method calcination at 1100℃for 2 h.The powder is about 2μm spherical,the excitation peak is in the 319 nm ultraviolet region,and the emission peak is in the 479 nm blue region.The color coordinates of the sample are located at(0.1044,0.1224),a blue phosphor that is expected to be applied to white LEDs.
作者
李兆
王亚楠
徐祎朴
曹静
王永锋
吴坤尧
邓璐
LI Zhao;WANG Ya-nan;XU Yi-pu;CAO Jing;WANG Yong-feng;WU Kun-yao;DENG Lu(School of Materials Engineering,Xi’an Aeronautical University,Xi’an 710077,China)
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2023年第2期623-628,共6页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(51474170)
陕西省教育厅专项(17JK0395)
西安市科技计划项目(GXYD9.2)资助。
