摘要
荧光型白光LED的光谱结构相对固定,蓝光成分偏多、红光和绿光成分偏少,相关色温不易调整且普遍较高,同时显色特性亦存在不足。针对荧光型白光LED,通过光谱补偿的方式构建了可调白光LED系统,提高了光谱在可见光范围内的连续性和均匀性,在实现混合光谱相关色温可调的同时改善了显色特性。结合LED器件的光电热特性分析,建立了混合光谱相关色温的非线性关系模型,可根据系统的电驱动状态快速预测混合光谱的相关色温,并可针对目标色温进行反向的驱动控制。经实验验证,所建立的非线性关系模型能够准确预测混合光谱的相关色温,误差不超过4.5%。而在针对目标色温的调光控制方面,混合光谱相关色温的调节误差不超过1.5%,且显色指数的提升率均超过5%,最高达到18.51%。由此表明,对荧光型白光LED进行光谱补偿可以有效改善光谱结构,实现高显色特性下的调光控制,提高照明品质和适用性。
Phosphor-converted(PC)white LEDs have relative fixed spectral structures,with much blue spectrum but less red and green components.As a result,their correlated color temperature(CCT)is difficult to adjust and generally high,accompanied by an insufficient color rendering index(CRI).For this reason,tunable white LED systems are constructed based on spectral compensation,which improves the spectral continuity and uniformity in the visible light range,thus to obtain the dynamic tunability of CCT and enhancement of CRI.Combined with the photo-electro-thermal characteristics analysis of LED devices,a nonlinear dynamic relationship model of CCT is established.This model allows for quick prediction of CCT for the mixed spectra under given electric driving states,and in reverse enabling driving control according to target CCTs.In verified experiments,the nonlinear dynamic relationship model of CCT can accurately predict CCTs with errors of no more than 4.5%.In terms of dimming for target CCTs,errors between actual CCTs and their target ones are less than 1.5%,with CRI upgrade rates exceeding 5%and even reaching up to 18.51%.All the experiment results suggest that spectral compensation is a feasible approach to optimize the spectral structure of PC white LEDs,in this way to achieve dimming control with an enhanced CRI,effectively improving lighting quality and applicability.
作者
沈雪华
陈焕庭
石为人
吴芮
叶选成
Shen Xuehua;Chen Huanting;Shi Weiren;Wu Rui;Ye Xuancheng(College of Intelligent Manufacturing,Guangzhou Maritime University,Guangzhou 510725,China;School of Physics and Information Engineering,Minnan Normal University,Zhangzhou 363000,China;Shenzhen Institute of Artificial Intelligence and Robotics for Society,Shenzhen 518129,China)
出处
《电子测量与仪器学报》
北大核心
2025年第7期88-97,共10页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金(62001200)
广州市基础研究计划(SL2024A04J01939)
福建省高校产学合作项目(2024H6014,2022G02006)资助。
关键词
发光二极管
LED照明光源
光谱补偿
动态照明
light-emitting diode
LED light sources
spectral compensation
dynamic lighting
