O644.1 2003042777碱金属碘化物分子的光离解及碱金属原子的共振电离研究=Study of resonant ionization of alkali metal atom producedby photodissociation of alkali metal iodide molecule[刊,中]/霍炳海(天津大学理学院.天津(3000...O644.1 2003042777碱金属碘化物分子的光离解及碱金属原子的共振电离研究=Study of resonant ionization of alkali metal atom producedby photodissociation of alkali metal iodide molecule[刊,中]/霍炳海(天津大学理学院.天津(300072)),崔拴锦…∥激光杂志.-2002,23(1).-52-53利用脉冲激光束与分子的相互作用,对KI和CsI分子进行了光离解。同时,另一束可调谐激光对离解后产生的中性碱金属原子K和Cs进行共振激发,然后把处在激发态的碱金属原子进行光电离,获得了碱金属离子的飞行时间质谱。另外,对光离解及光电离过程中可能存在的多光子电离(MPI)过程进行了讨论和分析。图4参7(李瑞琴)O644.18 2003042778对-叔丁基杯[4]芳烃酮的激光光解研究=Study of laserphotolysis of p-tert-oxocalix[4]arene[刊。展开更多
Exciton(or spin)statistics is a physical principle based on the statistics of spin multiplicity.In electroluminescence,injected electrons and holes have randomized spin states,and usually form singlet or triplet excit...Exciton(or spin)statistics is a physical principle based on the statistics of spin multiplicity.In electroluminescence,injected electrons and holes have randomized spin states,and usually form singlet or triplet excitons in the ratio of 1:3.Exciton statistics determines that the upper limit of internal quantum efficiency is 25%in fluorescent devices,since only singlet exciton can decay radiatively.However,both experimental and theoretical evidence indicate that the actual efficiency can exceed the exciton statistics limit of 25%by utilizing materials with special electronic structure and optimized device structures.These results bring light to break through the exciton statistics limit and develop new-generation fluorescent materials with low cost and high efficiency.Recently,the exciton statistics,which has attracted great attention in the past decade,is being rejuvenated due to the discovery of some fluorescent materials with abnormally high efficiencies.In view of their significance in theoretical research of organic semiconductors and developing new-generation OLED materials,such materials are widely investigated in both academic institutions and industry.Several key issues still require further clarification for this kind of materials,such as the molecular design concepts.Herein,we review the progress of the materials with efficiency exceeding the exciton statistics limit,and the routes to improve exciton utilization efficiency.In the end,we present an innovative pathway to fully harvest the excitons in fluorescent devices,namely,"hot exciton"model and relevant fluorescence material with hybridized local and charge-transfer(HLCT)excited state.展开更多
文摘O644.1 2003042777碱金属碘化物分子的光离解及碱金属原子的共振电离研究=Study of resonant ionization of alkali metal atom producedby photodissociation of alkali metal iodide molecule[刊,中]/霍炳海(天津大学理学院.天津(300072)),崔拴锦…∥激光杂志.-2002,23(1).-52-53利用脉冲激光束与分子的相互作用,对KI和CsI分子进行了光离解。同时,另一束可调谐激光对离解后产生的中性碱金属原子K和Cs进行共振激发,然后把处在激发态的碱金属原子进行光电离,获得了碱金属离子的飞行时间质谱。另外,对光离解及光电离过程中可能存在的多光子电离(MPI)过程进行了讨论和分析。图4参7(李瑞琴)O644.18 2003042778对-叔丁基杯[4]芳烃酮的激光光解研究=Study of laserphotolysis of p-tert-oxocalix[4]arene[刊。
基金financially supported by the National Science Foundation of China(51073069,51273078)the National Basic Research Program of China(2013CB834801)
文摘Exciton(or spin)statistics is a physical principle based on the statistics of spin multiplicity.In electroluminescence,injected electrons and holes have randomized spin states,and usually form singlet or triplet excitons in the ratio of 1:3.Exciton statistics determines that the upper limit of internal quantum efficiency is 25%in fluorescent devices,since only singlet exciton can decay radiatively.However,both experimental and theoretical evidence indicate that the actual efficiency can exceed the exciton statistics limit of 25%by utilizing materials with special electronic structure and optimized device structures.These results bring light to break through the exciton statistics limit and develop new-generation fluorescent materials with low cost and high efficiency.Recently,the exciton statistics,which has attracted great attention in the past decade,is being rejuvenated due to the discovery of some fluorescent materials with abnormally high efficiencies.In view of their significance in theoretical research of organic semiconductors and developing new-generation OLED materials,such materials are widely investigated in both academic institutions and industry.Several key issues still require further clarification for this kind of materials,such as the molecular design concepts.Herein,we review the progress of the materials with efficiency exceeding the exciton statistics limit,and the routes to improve exciton utilization efficiency.In the end,we present an innovative pathway to fully harvest the excitons in fluorescent devices,namely,"hot exciton"model and relevant fluorescence material with hybridized local and charge-transfer(HLCT)excited state.