有机发光二极管(Organic light-emitting diodes,OLEDs)作为照明和显示领域极其具有竞争力的技术,近年来备受关注。实现超简单、高效率、低滚降的白光OLEDs,对有机发光层材料的选择至关重要。杂化局部和电荷转移(Hybridized local and c...有机发光二极管(Organic light-emitting diodes,OLEDs)作为照明和显示领域极其具有竞争力的技术,近年来备受关注。实现超简单、高效率、低滚降的白光OLEDs,对有机发光层材料的选择至关重要。杂化局部和电荷转移(Hybridized local and charge transfer,HLCT)材料的“热激子”通道可以将高能三线态激子窜跃至单线态,实现理论上100%的激子利用率,快速的反向系间窜跃可有效抑制三线态激子猝灭,从而降低器件效率滚降。基于此,本文首先通过电荷平衡策略优化器件结构,制备了基于HLCT材料pCzAnN的高效蓝光OLED。在此基础上,以pCzAnN作为传统荧光材料的敏化主体,通过不完全能量传递策略,实现了双色及三色白光OLEDs制备。制备的白光OLEDs最高显色指数达到90,最大外量子效率达到8.76%,且展现出较低效率滚降及良好的光谱稳定性。本研究对开发简单、高效率、低滚降白光OLEDs具有指导意义。展开更多
Based on the criteria for additional surface acidity generation in composite oxides and composite fluorides proposed by Tanabe and Kemnitz et al.A hypothesis for the origin of additional surface acidity in solid compo...Based on the criteria for additional surface acidity generation in composite oxides and composite fluorides proposed by Tanabe and Kemnitz et al.A hypothesis for the origin of additional surface acidity in solid composites with the same metal cations is proposed.The surface acidsites of We analyze three types of solid composite systems,that is,CrF_(3)/Cr_(2)O_(3),MgF_(2)/MgO,and ZnF_(2)/ZnO,is systematically analyzed,which agrees with experimental results.Accordingly,the origin of additional surface acidity in these solid composites is reasonably explained,and the types of acidic sites are also predicted.展开更多
文摘有机发光二极管(Organic light-emitting diodes,OLEDs)作为照明和显示领域极其具有竞争力的技术,近年来备受关注。实现超简单、高效率、低滚降的白光OLEDs,对有机发光层材料的选择至关重要。杂化局部和电荷转移(Hybridized local and charge transfer,HLCT)材料的“热激子”通道可以将高能三线态激子窜跃至单线态,实现理论上100%的激子利用率,快速的反向系间窜跃可有效抑制三线态激子猝灭,从而降低器件效率滚降。基于此,本文首先通过电荷平衡策略优化器件结构,制备了基于HLCT材料pCzAnN的高效蓝光OLED。在此基础上,以pCzAnN作为传统荧光材料的敏化主体,通过不完全能量传递策略,实现了双色及三色白光OLEDs制备。制备的白光OLEDs最高显色指数达到90,最大外量子效率达到8.76%,且展现出较低效率滚降及良好的光谱稳定性。本研究对开发简单、高效率、低滚降白光OLEDs具有指导意义。
基金The Key Research and Development Program of Zhejiang Province(2021C01003)National Natural Science Foundation of China(52025011,51971202,51872260 and 52171019)The Zhejiang Provincial Natural Science Foundation of China(LD19B030001,Z4080070 and LR23B030004)。
文摘Based on the criteria for additional surface acidity generation in composite oxides and composite fluorides proposed by Tanabe and Kemnitz et al.A hypothesis for the origin of additional surface acidity in solid composites with the same metal cations is proposed.The surface acidsites of We analyze three types of solid composite systems,that is,CrF_(3)/Cr_(2)O_(3),MgF_(2)/MgO,and ZnF_(2)/ZnO,is systematically analyzed,which agrees with experimental results.Accordingly,the origin of additional surface acidity in these solid composites is reasonably explained,and the types of acidic sites are also predicted.