CN110024141A - 具有降低的黑视素光谱含量的照明*** - Google Patents
具有降低的黑视素光谱含量的照明*** Download PDFInfo
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Abstract
所公开的发光装置可以提供白光,该白光具有与黑视素敏感范围相一致的青色间断,并且因此具有降低的黑视素含量。所公开的发光装置可以包括提供具有小于450纳米(nm)的峰值波长的紫光或蓝光的光源。所公开的发光装置可以包括至少一个下转换器,该至少一个下转换器耦合到光源并位于光源的下游,并且被配置有长波长起始,来转换紫光或蓝光的光谱,以生成在447‑531 nm波长范围中的光谱功率含量小于或等于在380‑780 nm波长范围中的总光谱功率含量的10%的白光。所公开的发光装置可以被并入光引擎***中,该光引擎***还包括控制到发光装置的驱动电流的控制***。
Description
相关申请的交叉引用
此申请要求2016年9月12日提交的美国临时申请第62/393306号的权益,其通过引用并入,如同被完全阐述。
技术领域
本文中的本公开大体上涉及具有改进的非视觉响应的发光装置。
背景技术
发光二极管(LED)是在多种应用(诸如显示光、警告光、指示光或者期望白光或有色光的其他应用)中被用作光源的半导体光发射器。由LED产生的光的颜色是至少部分地由在其制造中所使用的半导体材料的类型确定的。对于在一般光照应用(例如一般或环境照明)中使用的LED而言,由于实际发射器和转换器材料的限制,发射光谱(即,光的强度与其波长的关系)可以是一方面的优选色点与色彩还原(光源在物体的有色外观上的效果以及色彩质量的一方面)以及另一方面的(发光)效能之间的妥协的结果。
在示例中,针对户外和工业应用的现有LED设计通常最优化效能而非色彩质量,因为这种应用典型地具有提供对发掘显著能源节约的潜在可能的长操作时长,并且通常不需要高色彩逼真度。与户外和工业应用相关联的这些特性已经引起具有冷白及中性白相关色温(CCT)(例如CCT值为4000 开尔文(K)及之上)的、具有中等显色指数(CRI)(CRI为百分之零至百分之百的范围,其指示当与“参考”光源进行比较时,给定光源在显色时的准确程度)的LED的流行。具有中等CRI的冷白LED的示例是4000 K/70 LED,其具有等于4000 K的CCT和70的CRI值。与如4000 K/70 LED的这种现有LED相关联的发射光谱比它们替代的现有技术中的一些(例如,高压钠照明)具有显著更多的蓝色光谱含量,这导致了最近关于它们对人类生理机能、以及特别是昼夜节律的影响的担忧。
发明内容
所公开的发光装置可以提供白光,该白光具有与黑视素敏感范围相一致的青色间断,并且因此具有降低的黑视素含量。所公开的发光装置可以包括光源,该光源提供具有小于450纳米(nm)(例如410-420 nm、420-430 nm、430-440 nm或440-450 nm)的峰值波长的紫光或蓝光。所公开的发光装置可以包括至少一个下转换器(down-converter),其耦合到光源并位于光源的下游,并且被配置有长波长起始(onset),来转换紫光或蓝光的光谱,以生成在447-531 nm波长范围中的光谱功率含量小于或等于在380-780 nm波长范围中的总光谱功率含量的10%的白光。所公开的发光装置可以提供具有至少2700 开尔文(K)的相关色温(CCT)的白光。至少一个下转换器可以是具有在琥珀色波长范围中的峰值发射的基于氮化物的磷光体***。基于氮化物的磷光体***的示例材料包括(Ba,Sr)2Si5N8:Eu (BSSN)和/或 (Sr,Ca)SiAIN3:Eu (SCASN)。所公开的发光装置可以被并入光引擎***中,该光引擎***还包括控制到发光装置的驱动电流的控制***。
附图说明
图1是根据本文中的本公开的示例发光装置的示意图;
图2是被配置为发射白光的若干发光装置的光谱或光谱密度图,该白光在黑视素敏感范围中具有降低的光谱含量,如相较于黑视素响应函数示出的;和
图3是示出具有图2中示出的光谱的发光装置的光谱度量的表。
具体实施方式
人类昼夜节律是人类生理过程中的二十四小时循环,并且包括显示出内源性的且可诱导(entrainable)的震荡的任何生物过程。诱导是昼夜节律与环境之间的交互,诸如对昼夜节律的向着由地球的旋转决定的每日亮-暗循环的诱导。
除了常规的视杆细胞和视锥细胞之外,光引发的节律诱导和对光的其他非视觉响应还受到眼睛中的一不同的光感受器,本征光敏视网膜神经节细胞(ipRGC),的影响。一起地,这些响应可以产生类似白天的生理状态。例如,光使瞳孔收缩、抑制松果体褪黑素的产生、增加心率以及核心躯体温度、刺激皮质醇的产生并且充当神经生理***。
经验证据已经示出,这些非视觉响应一般在可见光谱的短波长末端部处具有峰值光谱敏感度。这与黑视蛋白(melanopsin)的作用光谱相关,黑视蛋白是眼睛中的由ipRGC表达的感光色素(即一种色素,其化学状态取决于其光照程度),并且其峰值位于490 nm的波长处。黑视素敏感范围是447-531 nm半峰全宽(FWHM)(即,在位于光谱密度曲线上的光谱密度达到其最大值的一半的点之间的曲线的宽度)。然而,ipRGC的放电模式(firingpattern)不仅基于黑视蛋白光转导,还基于来自视杆细胞和视锥细胞的输入,这是由于它们的神经生理联系。因此,非视觉响应的光谱敏感度一般是更复杂的,因为它受到总光谱及照度(即每单位面积的光通量的量)的影响,并且可能在具体生理响应之间是不同的。工具可用于针对给定光谱计算五种人类感光色素的光谱加权辐照度(每单位面积的辐射能量通量),该五种人类感光色素得到确认。这些工具然后可以用作研究和量化光谱唤起非视觉响应的能力的起点。
在包括一般目的、户外和工业应用的许多照明应用中,期望的是,在提供具有高能量效率的充足视觉照度的同时,最小化非视觉响应,这可以通过最小化黑视素敏感范围中的光谱含量来完成。现有的中性白的磷光体转换LED(pc-LED)在黑视素敏感范围(447-531nm FWHM)中具有显著的光谱含量,其可以是非视觉响应的主导因素。例如,典型的4000 K/70 LED在黑视素敏感范围中的光谱功率含量是26%。
在常规白光pc-LED的情况下,在保持黑体轨迹上的色点(即白炽黑体的颜色随着黑体温度变化将在特定色度空间中占据的路径上的颜色)的同时降低黑视素敏感范围中的光谱含量可以涉及向深暖白色移动。深暖白色LED的一示例是2200 K/80 LED,其在黑视素范围中具有11%的光谱功率含量。然而,2200 K/80 LED一般不是期望的,因为不期望的色点(大多数应用指定27000 K和4000 K之间的光)和更低得多的效能。暖白光源需要显著红色到深红色的光谱含量,以保持良好的显色。在相关联的波长(例如620-750 nm)处,人类眼睛的敏感度是相对低的,并且因此,发光效能(以流明每瓦特lm/W为单位)是低的,并且低效率由于发射所发射的波长中的大部分超出人类眼睛的敏感度的光谱而加剧。
由此,为了解决上文提出的担忧,公开了一种pc-LED,其具有如下发射光谱,该发射光谱在仍然实现允许高(发光)效能的具有2700 K或更高的CCT的白色色点的同时,最小化黑视素敏感范围中的光谱含量。所公开的pc-LED可以使用短波长泵浦的LED(例如蓝色或紫色LED)和转换器来实现,其中转换器耦合到短波长泵浦的LED并位于其上方,从而具有发射光谱的长波长起始,从而在所发射的光谱中创建与黑视素范围相一致的青色间断。转换器的一示例是在短波长泵浦的LED上面或其上方的磷光体层或涂层,使得由LED生成的光(光子)行进通过磷光体层。所公开的pc-LED实现了大约5%的黑视素范围中的光谱功率含量,同时实现了比现有技术的4000 K/70 LED改进了约15%的辐射发光效能(LER)。所公开的LED在下文中被更详细的描述。
尽管在本文中,示例实施例可能是关于LED光源和基于磷光体的转换器来描述的,但是可以类似地使用任何其他光源(例如激光二极管)和/或转换器(量子点转换器)。
在示例实施例中,所公开的发光装置是紫色或蓝色pc-LED(或激光二极管),其具有450 nm或更小(例如410-420 nm、420-430 nm、430-440 nm或440-450 nm)的泵浦波长,并且具有一经转换即具有CCT为2700 K或更高的基本上白色色点以及为在380 nm和780 nm之间的总功率的10%或更少的在447-531 nm波长范围中的光谱功率含量的总发射光谱。
在示例实施例中,所公开的发光装置可以是具有基于氮化物的磷光体***的LED,其中基于氮化物的磷光体***具有在琥珀色波长范围(大约为570-600 nm)中的峰值发射。用于磷光体***的材料的示例可以包括但不限于(Ba,Sr)2Si5N8:Eu (“BSSN”) 、 (Sr,Ca)SiAIN3:Eu (“SCASN”)、BSSN和SCASN两者的混合和/或具有在期望的琥珀色波长范围中的发射的任何磷光体。在示例中,所公开的LED可以是高功率倒装芯片管芯,并且磷光体可以被集成为附接到管芯的陶瓷板。然而,可以类似地采用其他pc-LED装置架构。
在另一示例实施例中,所公开的发光装置可以被并入光引擎中,其中光引擎还包括各自具有青色加强光谱的一个或多个光发射器和控制青色减少的发射器及青色加强的发射器的驱动电流的控制***。控制***然后可以被配置为取决于应用需要而抑制或唤起非视觉响应。
图1是根据本文中的本公开的示例发光装置100的示意图。发光装置100可以被配置为提供白光101。发光装置100可以包括被配置为提供光源光103的光源102。例如,光源102可以提供紫色到蓝色的光源光103,其具有在400-460 nm的范围中(例如410-450 nm)的波长。在示例中,光源102可以被实施为泵浦的LED,诸如紫色泵浦的LED或蓝色泵浦的LED。例如,光源102可以是高功率倒装芯片管芯。
发光装置100可以包括发光材料元件104。例如,发光材料元件104可以包括一个或多个转换器,诸如一个或多个窄带转换器(例如量子点转换器)。例如,发光材料元件104可以包括(多个)下转换器或者下转换材料,其将由光源102提供的高能光子转换为低能光子以构建光谱的其余部分。在示例中,发光材料元件104可以是基于氮化物的磷光体***,并且可以由磷光体材料(诸如本文所描述的示例中的任何一项)组成。在示例中,发光材料元件104可以是附接到光源102的陶瓷板。发光材料元件104可以位于光源102的下游(在光发射的方向上),并且特别是相对于光源102的发光表面106的下游。在发光材料元件104中使用的材料可以被配置为吸收光源光103的至少一部分(例如紫光或蓝光),并且可以将光源光103转换为发光材料光105。发光材料元件104对于光源光103的至少一部分而言可以是透射(即允许光穿过)的。发光材料元件104可以具有波导性质。因此,从发光装置100发射的白光101可以包括光源光103的至少某部分以及发光材料光105的至少某部分。
在示例中,发光材料元件104可以包括发光材料110,其提供发光材料光105。在此示例中,发光材料110被指示为发光材料元件104内的颗粒或区域。然而,发光材料110可以均匀分布在发光材料元件104之上。在示例中,发光材料110可以由提供黄光和/或提供延伸到红光中的更宽的组合发射光谱的磷光体组成。
发光材料元件104和光源102的发光表面106之间的距离由d1指示。例如,距离d1实际上可以是0 mm(例如,发光材料元件104可以与光源102的发光表面106物理接触,或者被厚度仅几微米的透明基体或胶结合分开)或者可以大于0 mm(例如10 mm)。在示例中,发光材料元件104的厚度d2可以在5 μm至10 μm的范围中。厚度d2可以取决于应用类型(例如,用于非远程或附近应用的更薄的层厚度,和用于远程应用的更大的层厚度d2)。
图2是被配置为发射白光的若干发光装置的光谱或光谱密度图(以任意单位(a.u.)归一化示出),该白光在黑视素敏感范围中具有降低的光谱含量,如相较于黑视素响应函数(由短划线示出)示出的。图2中表现的光谱的度量在图3中给出。以流明每瓦特(lm/W)测量的辐射发光效能(LER)是光通量与功率的比,并且提供对光源产生可见光的良好程度的测量。在0-100的范围上,CRI指示当与参考光源比较时给定光源显色的准确程度(CRIRa指的是CRI中定义的第一个八指数的平均)。
图2中所表现的发光装置是:LED 201(由一长划/一短划线示出),其可以是现有技术4000 K/70 LED;LED 202(由一长划/双短划线示出),其可以是示例3000 K pc-LED,如根据本文中的本公开实施的;LED 203(由点线示出),其可以是具有进一步改进的LER的另一示例3000 K LED,如根据本文中的本公开实施的;以及LED 204(由实线示出),其可以是具有改进的CRI的另一示例3000 K LED,如根据本文中的本公开实施的。
图2中示出的光谱密度在给定适光(photopic)照度处展现出降低的黑视素照度(在大约447-531 nm FWHM范围中)。如通过图2中示出的光谱以及图3中的对应数据所图示的,根据本文中的本公开实施的示例LED 202、203和204具有比现有技术4000 K/70 LED201的LER(342 lm/W)显著更高的LER(分别为397 lm/W、434 lm/W和382 lm/W)。此外,与使用磷光体粉末的磷光体集成技术相比,可以在发光装置中用作转换器的陶瓷板技术(例如基于磷光体的)可以降低散射,这可以进一步增加总发光效能。
在示例中,LED 203和/或LED 204可以包含一个或多个窄带转换器,例如量子点转换器,来实现图2中示出的分别的期望光谱。通过设计,如在图2中的光谱中示出的,创建青色间断可以使青色不饱和,同时使与青色间断相邻的紫-蓝色和绿-黄色过饱和。通过调整发射光谱的剩余部分,对这种显色上的饱和与不饱和的影响可以被最小化,并且可以实现高于60的CRI,同时仍然保持最小的青色含量。长波长处的优秀的显色补偿了短波长的较弱的显色,以实现可接受的总CRI。
图3示出了针对具有图2中示出的光谱的LED光发射器设计中的每一个的色度、LER、显色(CRI)和黑视素光谱含量的关键光谱度量。示例LED 201-204具有小“Duv”值,“Duv”是距CIE 1976色彩空间中的黑体轨迹的距离,并且因此指示示例LED 201-204的白色。如上文所解释的,根据本文中的本公开实施的示例LED 202、203和204具有比现有技术4000 K/70 LED 201的LER更高的LER,并且因此具有改进的发光效能。TM-30是显色度量,其由逼真度(TM-30 Rf)、色域(TM-30 Rg)和示出各个色彩的饱和度的TM-30色彩矢量图形组成。黑视素光谱含量可以由447-531 nm的黑视素FWHM内的辐射度量功率的分数表示,或者由黑视素通量和适光通量的比(m/p比)表示。后者更准确地反映了通过黑视素敏感曲线的加权。
本文所描述的本公开包括示例实施例,使得本领域技术人员可以修改、调整、省略或使用等价元件代替所描述的元件。
Claims (20)
1. 一种发光装置,所述发光装置被配置为提供具有与黑视素敏感范围相一致的青色间断的白光,所述发光装置包括:
光源,所述光源被配置为提供具有小于450纳米(nm)的峰值波长的紫光或蓝光;和
至少一个下转换器,所述至少一个下转换器耦合到所述光源并位于所述光源的下游,并且被配置有长波长起始,来转换所述紫光或蓝光的光谱,以生成在447-531 nm波长范围中的光谱功率含量小于或等于在380-780 nm波长范围中的总光谱功率含量的10%的白光。
2.根据权利要求1所述的发光装置,所述发光装置被配置为提供具有大于或等于2700开尔文(K)的相关色温(CCT)的白光。
3. 根据权利要求1所述的发光装置,其中,所述光源被配置为提供具有在410 nm和420nm之间的峰值波长的紫光或蓝光。
4. 根据权利要求1所述的发光装置,其中,所述光源被配置为提供具有在420 nm和430nm之间的峰值波长的紫光或蓝光。
5. 根据权利要求1所述的发光装置,其中,所述光源被配置为提供具有在430 nm和440nm之间的峰值波长的紫光或蓝光。
6. 根据权利要求1所述的发光装置,其中,所述光源被配置为提供具有在440 nm和450nm之间的峰值波长的紫光或蓝光。
7.根据权利要求1所述的发光装置,其中,所述光源被配置为短波长泵浦的磷光体转换发光二极管(pc-LED)。
8.根据权利要求7所述的发光装置,其中,所述pc-LED是高功率倒装芯片管芯。
9.根据权利要求8所述的发光装置,其中,所述至少一个下转换器是附接到所述高功率倒装芯片管芯的陶瓷板。
10.根据权利要求1所述的发光装置,其中,所述至少一个下转换器是具有在琥珀色波长范围中的峰值发射的基于氮化物的磷光体***。
11. 根据权利要求10所述的发光装置,其中,所述基于氮化物的磷光体***是由下列材料中的至少一种制成的:(Ba,Sr)2Si5N8:Eu (BSSN) 或 (Sr,Ca)SiAIN3:Eu (SCASN)。
12.根据权利要求1所述的发光装置,其中,所述至少一个下转换器是磷光体涂层。
13.根据权利要求1所述的发光装置,其中,所述至少一个下转换器是量子点转换器。
14.根据权利要求1所述的发光装置,其中,所述至少一个下转换器包括吸收所述紫光或蓝光的至少一部分的发光材料。
15.根据权利要求1所述的发光装置,其中,所述至少一个下转换器包括透射所述紫光或蓝光的至少一部分的发光材料。
16.根据权利要求1所述的发光装置,其中,所述至少一个下转换器被配置为提供黄光,使得所述发光装置提供延伸至红光中的更宽的组合发射光谱。
17.根据权利要求1所述的发光装置,其中,所述至少一个下转换器与所述光源的发光表面接触。
18.根据权利要求1所述的发光装置,其中,所述至少一个下转换器位于距所述光源的发光表面非零距离处。
19.根据权利要求1所述的发光装置,所述发光装置被实施在光引擎中,所述光引擎还包括控制到所述发光装置的驱动电流的控制***。
20.一种光引擎,所述光引擎被配置为提供在与黑视素敏感范围相一致的范围中具有可调光谱含量的白光,所述光引擎包括:
多个发光装置,所述多个发光装置中的每一个包括:
光源,所述光源被配置为提供具有小于450纳米(nm)的峰值波长的紫光或蓝光;和
至少一个下转换器,所述至少一个下转换器耦合到所述光源并位于所述光源的下游,并且被配置有长波长起始,来转换所述紫光或蓝光的光谱,以生成在447-531 nm波长范围中的光谱功率含量小于或等于在380-780 nm波长范围中的总光谱功率含量的10%的白光;和
控制***,被配置为控制到所述多个发光装置的驱动电流。
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TWI756262B (zh) | 2022-03-01 |
KR20190047016A (ko) | 2019-05-07 |
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CN110024141B (zh) | 2022-02-15 |
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US20190219234A1 (en) | 2019-07-18 |
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