This short paper is about art and science and the human struggle to figure out the world we live in. It is also about the imagination and human progress, rationality and subjectivity, as well as the development of dev...This short paper is about art and science and the human struggle to figure out the world we live in. It is also about the imagination and human progress, rationality and subjectivity, as well as the development of devices to ascertain out accurate knowledge--and yet the imagination and forms of thought are themselves devices that are integral to mechanical inventions. At the core of the subject under discussion, the aesthetic can be found reasons for the existence of other phenomena, the rational and the sensitive, epistemology and phenomenology, fulfilling human pleasure and necessity, and moving forward a humanized cosmos. Somewhere seems to rise and grow afresh a precise image of what we actually are and it can be revealed simply by being in the world and experiencing it on the basis of the mind-body-worM or by extending human senses through technology.展开更多
Developing metal-free and long lifetime room-temperature phosphorescence(RTP)materials has received tremendous interest due to their numerous potential applications,of which stable triplet-excited state is the core ch...Developing metal-free and long lifetime room-temperature phosphorescence(RTP)materials has received tremendous interest due to their numerous potential applications,of which stable triplet-excited state is the core challenge.Here,boron carbon oxynitride(BCNO)dots,emitting stable blue fluorescence and green RTP,are reported for the first time.The obtained BCNO dots exhibit an unexpected ultralong RTP lifetime of 1.57 s,lasting over 8 s to naked eyes.The effective doping of carbon and oxygen elements in boron nitride(BN)actually provides a small energy gap between singlet and triplet states,facilitating the intersystem crossing(ISC)and populating of triplet excitons.The formation of compact cores via crystallization and effective inter-/intra-dot hydrogen bonds further stabilizes the excited triplet states and reduces quenching of RTP by oxygen at room temperature.Based on the water-soluble feature of BCNO dots,a novel advanced security ink is developed toward anti-counterfeiting tag and confidential information encryption.This study extends BCNO dots to rarely exploited phosphorescence fields and also provides a facile strategy to prepare ultralong lifetime metal-free RTP materials.展开更多
文摘This short paper is about art and science and the human struggle to figure out the world we live in. It is also about the imagination and human progress, rationality and subjectivity, as well as the development of devices to ascertain out accurate knowledge--and yet the imagination and forms of thought are themselves devices that are integral to mechanical inventions. At the core of the subject under discussion, the aesthetic can be found reasons for the existence of other phenomena, the rational and the sensitive, epistemology and phenomenology, fulfilling human pleasure and necessity, and moving forward a humanized cosmos. Somewhere seems to rise and grow afresh a precise image of what we actually are and it can be revealed simply by being in the world and experiencing it on the basis of the mind-body-worM or by extending human senses through technology.
基金The authors are grateful to the National Natural Science Foundation of China(NSFC)(Nos.51872172 and 51972197)Natural Science Foundation of Shandong Province(Nos.ZR2018MEM010 and ZR2019MEM021)+1 种基金Major Research and Development Program for Public Welfare in Shandong(No.2018GGX102021)Young Scholars Program of Shandong University.
文摘Developing metal-free and long lifetime room-temperature phosphorescence(RTP)materials has received tremendous interest due to their numerous potential applications,of which stable triplet-excited state is the core challenge.Here,boron carbon oxynitride(BCNO)dots,emitting stable blue fluorescence and green RTP,are reported for the first time.The obtained BCNO dots exhibit an unexpected ultralong RTP lifetime of 1.57 s,lasting over 8 s to naked eyes.The effective doping of carbon and oxygen elements in boron nitride(BN)actually provides a small energy gap between singlet and triplet states,facilitating the intersystem crossing(ISC)and populating of triplet excitons.The formation of compact cores via crystallization and effective inter-/intra-dot hydrogen bonds further stabilizes the excited triplet states and reduces quenching of RTP by oxygen at room temperature.Based on the water-soluble feature of BCNO dots,a novel advanced security ink is developed toward anti-counterfeiting tag and confidential information encryption.This study extends BCNO dots to rarely exploited phosphorescence fields and also provides a facile strategy to prepare ultralong lifetime metal-free RTP materials.
