Using a color-tunable organic light-emitting diode (CT-OLED) can accord with the circadian cycle of humans and realize healthy lighting. The variation range of the correlated color temperature (CCT) is an important pa...Using a color-tunable organic light-emitting diode (CT-OLED) can accord with the circadian cycle of humans and realize healthy lighting. The variation range of the correlated color temperature (CCT) is an important parameter to measure the performance of CT-OLEDs. In this paper, the effect of changing the utilization of phosphorescent materials and the position of the recombination zone (RZ) in the device are investigated by changing the thickness of the emissive layer (EML) and the doping ratio of the host and vip materials. The results show that reducing the red phosphorescent material and improving the blue phosphorescent material can affect the change direction of CCT, but it is not enough to expand the span of CCT (ΔCCT). It is more conducive to improving ΔCCT by more reasonable regulation of the position of the main RZ in EML and the energy transfer from the blue sub-EML to the red sub-EML. Device D obtains the best electro-optic and spectral characteristics, in which the maximum ΔCCT is 5746 K (2661 - 8407 K) as the voltage changes from 3.75 V to 9.75 V, the maximum current efficiency and luminance reach 18.34 cd·A<sup>-1</sup> and 12,100 cd·m<sup>-2</sup>, respectively.展开更多
针对新一代海洋水色观测卫星海岸带成像仪(coastal zone imager,CZI)需在海岸带区域实现高分辨率、高信噪比、大动态范围、大幅宽和多谱段探测等需求,以及体积小、质量小等约束条件,开展了CZI的设计与验证工作。首先,设计了大范围、高...针对新一代海洋水色观测卫星海岸带成像仪(coastal zone imager,CZI)需在海岸带区域实现高分辨率、高信噪比、大动态范围、大幅宽和多谱段探测等需求,以及体积小、质量小等约束条件,开展了CZI的设计与验证工作。首先,设计了大范围、高精度指向机构,通过摆镜组件扩大可视范围,以获取大幅宽范围内的海岸带观测图像。提出了透射与反射比可控的视场复用成像设计方法,实现了光机主体结构轻小型化。其次,设计了多谱段交错布局,提高了海岸带区域9个谱段探测的配准精度。然后,提出了“外+内”嵌套式两级消杂光方案,有效抑制杂散光的传播途径,在大视场范围内实现优于2%的低杂光性能,从而提升海岸带成像质量。最后,进行了地面验证、视轴指向精度、杂光抑制及在轨成像性能等测试,完成了在轨成像质量评价。测试结果表明:轻小型、大幅宽及多谱段的新一代CZI能够在1029 km宽幅范围内对海岸带区域进行高精准指向探测,具备全色优于5 m、多光谱优于20 m的高分辨率海岸带多光谱探测能力,实现了9谱段高信噪比和大动态范围成像,显著提升了全球海陆交界范围内信息获取的效能。展开更多
为满足新一代海洋水色观测卫星载荷成像质量提升的需求,针对影响成像质量的关键因素,如信噪比(signal-to-noise ratio,SNR)、扫描机构稳定性及杂光抑制等,采取优化设计和控制措施。通过增大入光口径、增加扫描像元数量和积分时间、优化...为满足新一代海洋水色观测卫星载荷成像质量提升的需求,针对影响成像质量的关键因素,如信噪比(signal-to-noise ratio,SNR)、扫描机构稳定性及杂光抑制等,采取优化设计和控制措施。通过增大入光口径、增加扫描像元数量和积分时间、优化光路及调整时间延迟积分(time-delay integration,TDI)级数和增益等级等措施,提高了SNR;通过匀速扫描、缓启/缓停设计及提高测角分辨率等措施,增强了扫描机构稳定性的线性度;采用遮光罩、挡光板等组合结构抑制杂光;通过实时控制Y方向偏航修正偏流角。测试结果表明:水色水温扫描仪(Chinese ocean color and temperature scanner,COCTS)的SNR最高可达1760,扫描机构线性度为0.24%,杂光系数≤1%;海岸带成像仪(coastal zone imager,CZI)多光谱谱段的动态调制传递函数(modulation transfer function,MTF)≥0.20、全色谱段的MTF≥0.15。各类载荷在轨图像质量优良,为海洋资源开发、环境监测等提供了高质量数据支撑。展开更多
文摘Using a color-tunable organic light-emitting diode (CT-OLED) can accord with the circadian cycle of humans and realize healthy lighting. The variation range of the correlated color temperature (CCT) is an important parameter to measure the performance of CT-OLEDs. In this paper, the effect of changing the utilization of phosphorescent materials and the position of the recombination zone (RZ) in the device are investigated by changing the thickness of the emissive layer (EML) and the doping ratio of the host and vip materials. The results show that reducing the red phosphorescent material and improving the blue phosphorescent material can affect the change direction of CCT, but it is not enough to expand the span of CCT (ΔCCT). It is more conducive to improving ΔCCT by more reasonable regulation of the position of the main RZ in EML and the energy transfer from the blue sub-EML to the red sub-EML. Device D obtains the best electro-optic and spectral characteristics, in which the maximum ΔCCT is 5746 K (2661 - 8407 K) as the voltage changes from 3.75 V to 9.75 V, the maximum current efficiency and luminance reach 18.34 cd·A<sup>-1</sup> and 12,100 cd·m<sup>-2</sup>, respectively.
文摘为满足新一代海洋水色观测卫星载荷成像质量提升的需求,针对影响成像质量的关键因素,如信噪比(signal-to-noise ratio,SNR)、扫描机构稳定性及杂光抑制等,采取优化设计和控制措施。通过增大入光口径、增加扫描像元数量和积分时间、优化光路及调整时间延迟积分(time-delay integration,TDI)级数和增益等级等措施,提高了SNR;通过匀速扫描、缓启/缓停设计及提高测角分辨率等措施,增强了扫描机构稳定性的线性度;采用遮光罩、挡光板等组合结构抑制杂光;通过实时控制Y方向偏航修正偏流角。测试结果表明:水色水温扫描仪(Chinese ocean color and temperature scanner,COCTS)的SNR最高可达1760,扫描机构线性度为0.24%,杂光系数≤1%;海岸带成像仪(coastal zone imager,CZI)多光谱谱段的动态调制传递函数(modulation transfer function,MTF)≥0.20、全色谱段的MTF≥0.15。各类载荷在轨图像质量优良,为海洋资源开发、环境监测等提供了高质量数据支撑。
