1 之江实验室，浙江 杭州 311121
2 中国科学院上海光学精密机械研究所，上海 201800
3 中国科学院上海技术物理研究所，上海 200083
采用真空高温固相反应烧结技术制备了Ce∶Y3Al5O12（掺杂原子数分数为0.2%）与Al2O3复合相荧光陶瓷（简称Ce∶YAG-Al2O3），采用蓝光发光二极管（LED）芯片，以透射模式激发，系统研究了退火处理对荧光陶瓷发光性能的影响以及不同厚度与不同表面粗糙度的荧光陶瓷的发光性能的变化规律。结果表明，退火处理可明显改善荧光陶瓷的发光性能，且在相同激发条件下，随着荧光陶瓷厚度的增加，透射蓝光与荧光陶瓷所发出的黄绿荧光的强度比下降，色温降低，发光效率升高。陶瓷表面粗糙度的增加可明显提高荧光陶瓷的发光效率。对于同一荧光陶瓷样品，蓝光入射面的粗糙度小，光出射面的粗糙度大，有利于降低荧光陶瓷的色温，提高其发光效率。
1 中国科学院上海光学精密机械研究所微纳光电子功能材料实验室, 上海 201800
2 上海科技大学物质科学与技术学院, 上海 201210
研究了在恒温变电流与恒电流变温下蓝光单色芯片的电致发光光谱特征,以及在这两种模式下蓝光芯片与荧光陶瓷封装形成的白光LED的发光性能。结果表明:在温度一定的条件下,随着激发电流增大,LED芯片的发光光谱蓝移;在电流一定的条件下,随着蓝光LED芯片温度升高,LED芯片的发光光谱红移;蓝光芯片发射光谱的改变会影响荧光陶瓷的吸收转换效率,进而改变白光LED的发光性能。
材料 发光二极管 光谱 峰值波长 荧光陶瓷 激发电流 温度 中国激光
2021, 48(21): 2103003
Author Affiliations
Abstract
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Tb3Ga5O12 (TGG) is an excellent material for magneto-optical applications, and is the key component in Faraday isolators (FIs). The preparation process of transparent TGG ceramics is experimentally studied. The optical quality and the microstructure of the samples are investigated. The results show that the transmittance of the sample sintered at 1550°C is close to 72% in the region of 500–1500 nm. The Verdet constant at 632.8 nm measured at room temperature is 125.01 rad T 1 m 1, which is almost the same as that of a single crystal.
160.3820 Magneto-optical materials 140.3380 Laser materials 160.4670 Optical materials Chinese Optics Letters
2015, 13(3): 031602
1 江南大学物联网工程学院, 江苏 无锡 214122
2 中国科学院上海光学精密机械研究所, 上海 201800
采用CeO2，Al2O3，Y2O3，Pr6O11粉体材料按照(Ce0.001PrxY0.999-x)3Al5O12(x=0.001~0.005)混合均匀并压片成型，经冷等静压后在真空感应炉中烧结约18 h 制备出Ce，Pr:YAG 荧光透明陶瓷。样品的X 射线衍射(XRD)谱表明样品呈现纯YAG 相。分别测试不同掺Pr3+原子数分数样品的发射光谱，发现了Pr3+在610 nm 处的浅红光发射峰，通过改变Pr3+的掺杂原子数分数可有效调节白光的色温和相关显色指数。实验测试结果表明当Pr3+的原子数分数为0.1%时，Ce，Pr:YAG 透明陶瓷的综合参数较好。在注入电流为100 mA 的情况下，光效为90 lm/W，色温为4905 K，显色指数为80，色坐标为(0.35，0.41)。此结果在白光的色温、显色指数等性能方面较传统的荧光材料有很大的优势，有望在室内照明领域得到深入的应用。
材料 粉体材料 荧光陶瓷 真空烧结 红光发射 色温
Author Affiliations
Abstract
Re3+, Yb3+ co-doped (Re0.005YbxY(0.995-x))3Al5O12 [Re = Ce, Er, x = 0, 0.02, 0.05, 0.1, and 0.2] transparent ceramics are synthesized by the solid state reaction and vacuum sintering as the down-conversion (DC) materials. The photoluminescence excitation and the photoluminescence spectra demonstrate the near-infrared quantum cutting (QC) and the energy transfer (ET) from Re3+ to Yb3+ in both of these series of samples. The comparison of the near-infrared QC spectra of the two series of samples shows that the Ce3+, Yb3+ co-doped Y3Al5O12 transparent ceramic samples have much higher intensity of the emission spectra in the near-infrared region, and higher ET efficiency than the Er3+, Yb3+ co-doped ones. So, the Ce3+, Yb3+ DC ion pair is a better choice to improve the efficiency of the crystalline silicon-based solar cells.
160.5690 Rare-earth-doped materials 160.4670 Optical materials Chinese Optics Letters
2014, 12(s1): S11603
Author Affiliations
Abstract
The ion substitution characteristics of Y3+-doped (Tb0.8Y0.2)3Al5O12 transparent ceramics synthesized by a solid-state reaction and vacuum sintering are investigated. The sample sintered at 1 680 oC exhibits the best optical properties, yielding a transmittance >75% from 900 to 1 600 nm. The Verdet constant of this sample at 632.8 nm is –108.79 rad.T-1.m-1. X-ray diffraction (XRD) results show that all of the samples have a pure garnet crystal structure without secondary phases. The microstructure of the samples reveals homogeneous grain sizes that averages <10 \mu m.
Chinese Optics Letters
2013, 11(2): 021601
