Here,this work presents an air-stable ultrabright inverted organic lightemitting device(OLED)by using zinc ionchelated polyethylenimine(PEI)as electron injection layer.The zinc chelation is demonstrated to increase th...Here,this work presents an air-stable ultrabright inverted organic lightemitting device(OLED)by using zinc ionchelated polyethylenimine(PEI)as electron injection layer.The zinc chelation is demonstrated to increase the conductivity of the PEI by three orders of magnitude and passivate the polar amine groups.With these physicochemical properties,the inverted OLED shows a record-high external quantum efficiency of 10.0% at a high brightness of 45,610 cd m^(-2) and can deliver a maximum brightness of 121,865 cd m^(-2).Besides,the inverted OLED is also demonstrated to possess an excellent air stability(humidity,35%)with a half-brightness operating time of 541 h@1000 cd m^(-2) without any protection nor encapsulation.展开更多
Scintillators,which convert high-energy radiation into visible light,are indispensable in a wide array of applications,including medical imaging,environmental monitoring,and astronomy[1].However,current high-performan...Scintillators,which convert high-energy radiation into visible light,are indispensable in a wide array of applications,including medical imaging,environmental monitoring,and astronomy[1].However,current high-performance inorganic scintillators,such as ceramics and perovskites,are plagued by issues such as complex manufacturing processes,environmental toxicity,selfabsorption,and stability concerns[2,3].Organic alternatives,on the other hand,suffer from weak X-ray absorption and inefficient triplet exciton utilization[4].Although lanthanide ions uniquely combine high energy conversion efficiency and tunable luminescence for X-ray scintillation,organolanthanide molecules remain underexplored due to a limited understanding of excitonic dynamics within these complexes.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.61905086,62174067,62175085)Science and Technology Development Planning of Jilin Province(Project Nos.20190101024JH,20200201296JC)+1 种基金the Hong Kong Scholars Program(Project No.XJ2020028)grants from the Research Grants Council of the Hong Kong Special Administrative Region,China(Project Nos.11300418 and 11300419).
文摘Here,this work presents an air-stable ultrabright inverted organic lightemitting device(OLED)by using zinc ionchelated polyethylenimine(PEI)as electron injection layer.The zinc chelation is demonstrated to increase the conductivity of the PEI by three orders of magnitude and passivate the polar amine groups.With these physicochemical properties,the inverted OLED shows a record-high external quantum efficiency of 10.0% at a high brightness of 45,610 cd m^(-2) and can deliver a maximum brightness of 121,865 cd m^(-2).Besides,the inverted OLED is also demonstrated to possess an excellent air stability(humidity,35%)with a half-brightness operating time of 541 h@1000 cd m^(-2) without any protection nor encapsulation.
文摘Scintillators,which convert high-energy radiation into visible light,are indispensable in a wide array of applications,including medical imaging,environmental monitoring,and astronomy[1].However,current high-performance inorganic scintillators,such as ceramics and perovskites,are plagued by issues such as complex manufacturing processes,environmental toxicity,selfabsorption,and stability concerns[2,3].Organic alternatives,on the other hand,suffer from weak X-ray absorption and inefficient triplet exciton utilization[4].Although lanthanide ions uniquely combine high energy conversion efficiency and tunable luminescence for X-ray scintillation,organolanthanide molecules remain underexplored due to a limited understanding of excitonic dynamics within these complexes.
