为研究中口径PELE(Penetrator with Enhanced Lateral Effect,横向效应增强型侵彻体)弹头风帽的材料和结构对其毁伤钢筋混凝土靶效果的影响,采用三维非线性动力学有限元软件LS-DYNA对PELE弹进行了数值模拟,探讨了不同结构与材料的风帽...为研究中口径PELE(Penetrator with Enhanced Lateral Effect,横向效应增强型侵彻体)弹头风帽的材料和结构对其毁伤钢筋混凝土靶效果的影响,采用三维非线性动力学有限元软件LS-DYNA对PELE弹进行了数值模拟,探讨了不同结构与材料的风帽在多种速度下穿透0.25 m厚钢筋混凝土靶的表现。结果表明,在其他条件保持一致的情况下,以酚醛树脂为原料、采用镂空曲母线尖头结构的风帽,在毁伤钢筋混凝土靶时展现出更优异的性能。展开更多
Quasi-two-dimensional perovskites,with spectral tuning property,have opened up vast application prospects in the field of optoelectronic devices,especially in blue perovskite light-emitting diode(PeLED).However,relati...Quasi-two-dimensional perovskites,with spectral tuning property,have opened up vast application prospects in the field of optoelectronic devices,especially in blue perovskite light-emitting diode(PeLED).However,relatively high density of defect states usually results in nonradiative recombination loss due to unexpected carriers capture at prolonged transport,which limits high-performance PeLED.Here,we propose a method for preparing pure-blue PeLED using bifunctional amide molecules to modulate crystallization kinetics.This strategy inhibits the formation of the n=1 phase and simultaneously passivates defects with the bifunctional groups,thereby reducing the occurrence of nonradiative recombination.The external quantum efficiency of the pure-blue PeLED fabricated using this strategy is significantly enhanced,reaching 9.7% at 478 nm,which is about 7 times higher than that of the control device.This work provides a novel strategy on the selection of bifunctional passivators for perovskites.展开更多
基金the Key R&D Program of Zhejiang Province(No.2024C01193)the National Natural Science Foundation of China(Nos.52171145 and 52102293)the Graduate Scientific Research Foundation of Wenzhou University.
文摘Quasi-two-dimensional perovskites,with spectral tuning property,have opened up vast application prospects in the field of optoelectronic devices,especially in blue perovskite light-emitting diode(PeLED).However,relatively high density of defect states usually results in nonradiative recombination loss due to unexpected carriers capture at prolonged transport,which limits high-performance PeLED.Here,we propose a method for preparing pure-blue PeLED using bifunctional amide molecules to modulate crystallization kinetics.This strategy inhibits the formation of the n=1 phase and simultaneously passivates defects with the bifunctional groups,thereby reducing the occurrence of nonradiative recombination.The external quantum efficiency of the pure-blue PeLED fabricated using this strategy is significantly enhanced,reaching 9.7% at 478 nm,which is about 7 times higher than that of the control device.This work provides a novel strategy on the selection of bifunctional passivators for perovskites.
