Light Emitting Element, Light Emitting Device, and Lighting System
申请人:Tokuda Atsushi
公开号:US20080036369A1
公开(公告)日:2008-02-14
According to the present invention, a light-emitting element, a light-emitting device, and a lighting system, each of which has a broad spectrum like sunlight and has high color rendering properties, can be obtained. One embodiment of the present invention has a light-emitting device which includes at least two kinds of luminescence center materials, and at least one kind of the luminescence center materials is a quinoxaline derivative represented by the following general formula (1): wherein R1 to R4 are individually hydrogen or an alkyl group having 6 carbon atoms (a straight-chain structure or a branch structure).
Light emitting element, light emitting device, and lighting system
申请人:Semiconductor Energy Laboratory Co., Ltd.
公开号:US07951470B2
公开(公告)日:2011-05-31
According to the present invention, a light-emitting element, a light-emitting device, and a lighting system, each of which has a broad spectrum like sunlight and has high color rendering properties, can be obtained. One embodiment of the present invention has a light-emitting device which includes at least two kinds of luminescence center materials, and at least one kind of the luminescence center materials is a quinoxaline derivative represented by the following general formula (1):
wherein R1 to R4 are individually hydrogen or an alkyl group having 4 carbon atoms (a straight-chain structure or a branch structure).
[EN] LIGHT EMITTING ELEMENT, LIGHT EMITTING DEVICE, AND LIGHTING SYSTEM<br/>[FR] ELEMENT LUMINEUX, DISPOSITIF LUMINEUX ET SYSTEME D'ECLAIRAGE
申请人:SEMICONDUCTOR ENERGY LAB
公开号:WO2006022193A1
公开(公告)日:2006-03-02
According to the present invention, a light-emitting element, a light-emitting device, and a lighting system, each of which has a broad spectrum like sunlight and has high color rendering properties, can be obtained. One embodiment of the present invention has a light-emitting device which includes at least two kinds of luminescence center materials, and at least one kind of the luminescence center materials is a quinoxaline derivative represented by the following general formula (1): wherein R1 to R4 are individually hydrogen or an alkyl group having 6 carbon atoms (a straight-chain structure or a branch structure).
intramolecular charge transfer (ICT). Crystal structure of 3a showed twisted structure with herringbone packing arrangement and intermolecular π-π stacking of pyrene units. Compounds 3a-c displayed aggregationinduced excimer emission in aggregated states in THF-water mixtures due to intermolecular π-π interactions among pyrene units. The concentration dependent studies of 3a-d showed monomer/excimer conversion
基于喹喔啉和吡啶并[2,3- b ]吡嗪部分作为电子受体、1,4-亚苯基环作为间隔基和芘单元的一系列新型 Y 型推拉化合物的设计、合成和表征作为电子供体进行。研究了它们的结构、光物理、溶剂化变色、聚集、酸性荧光变色、湿度传感和热特性。据观察,由于增强的分子内电荷转移 (ICT),喹喔啉部分上吸电子基团的取代导致吸收和发射光谱的红移。3a的晶体结构呈人字形堆积排列和芘单元分子间π-π堆积的扭曲结构。化合物3a-c由于芘单元之间的分子间 π-π 相互作用,在 THF-水混合物中显示出聚集诱导的准分子发射。3a-d的浓度依赖性研究显示在 THF 溶剂中较高浓度下的单体/准分子转化。激发寿命分析表明,在较低浓度下,双指数衰减主要来自单体物质,而在较高浓度下,观察到三指数衰减,主要来自受激物质。发现单体物质的寿命 (2.9–3.3 ns) 高于准分子物质 (1.3–2.6 ns)。这些化合物在溶液和固态中显示出可逆的酸性荧光变色,先用