Achieving Dual Persistent Room‐Temperature Phosphorescence from Polycyclic Luminophores via Inter‐/Intramolecular Charge Transfer

2019 ◽  
Vol 7 (19) ◽  
pp. 1900511 ◽  
Author(s):  
Feiyang Li ◽  
Song Guo ◽  
Yanyan Qin ◽  
Yuxiang Shi ◽  
Meiping Han ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Room Temperature ◽  
Intramolecular Charge Transfer ◽  
Room Temperature Phosphorescence

scholarly journals Red Room-Temperature Phosphorescent Diimides: Molecular Design and Application

2019 ◽  
Author(s):  
Jiajun Du ◽  
Fan Liao ◽  
Ziye Wu ◽  
Wenhuan Huang ◽  
Fei Li ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Room Temperature ◽  
Molecular Design ◽  
Intramolecular Charge Transfer ◽  
Imaging Studies ◽  
Oxygen Sensitive ◽  
Photo Induced Electron Transfer ◽  
Naphthalene Diimides ◽  
Transfer State

N-Substituted naphthalene diimides (NDIs) were explored as purely organic room temperature phosphorescence (RTP) materials based on the strategy of intramolecular charge-transfer (ICT) mediation. A series of NDIs were designed and investigated for their luminescence properties. All emissive NDIs exhibited similar red RTP (emission range from ~600 to ~800 nm) in solid state media; the quantum yield (QY) of the obtained RTP relies heavily on the N-substitution. From poor to moderate to strong donor moieties, the QY increases but suddenly disappears. First-principle calculations reveal that a “sweet spot” for strong NDI RTP exists: while a suitable charge-transfer state can enhance RTP, a strong donor may cause total triplet quenching through the photo-induced electron transfer (PET) mechanism. Furthermore, combining NDI aggregation effects, we realized the reddest RTP ever reported for purely organic materials (Max emission = 675 nm, QY = 21.7%). Given the red emission, respectable QY and oxygen sensitive properties for some of the NDIs, they were tested as imaging agents for in vivo imaging studies.

X-ray excited ultralong room-temperature phosphorescence for organic afterglow scintillators

2020 ◽  
Vol 56 (88) ◽  
pp. 13559-13562
Author(s):  
Lele Tang ◽  
Jie Zan ◽  
Hao Peng ◽  
Xi Yan ◽  
Ye Tao ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Room Temperature ◽  
Lone Pair ◽  
Room Temperature Phosphorescence ◽  
X Ray ◽  
Lone Pair Electron

An X-ray excited organic afterglow scintillator is realized by embedding lone-pair electron involved n–π* transitions and charge transfer characters into H-aggregations.

scholarly journals Red Room-Temperature Phosphorescent Diimides: Molecular Design and Application

2019 ◽  
Author(s):  
Jiajun Du ◽  
Fan Liao ◽  
Ziye Wu ◽  
Wenhuan Huang ◽  
Fei Li ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Room Temperature ◽  
Molecular Design ◽  
Intramolecular Charge Transfer ◽  
Imaging Studies ◽  
Oxygen Sensitive ◽  
Photo Induced Electron Transfer ◽  
Naphthalene Diimides ◽  
Transfer State

N-Substituted naphthalene diimides (NDIs) were explored as purely organic room temperature phosphorescence (RTP) materials based on the strategy of intramolecular charge-transfer (ICT) mediation. A series of NDIs were designed and investigated for their luminescence properties. All emissive NDIs exhibited similar red RTP (emission range from ~600 to ~800 nm) in solid state media; the quantum yield (QY) of the obtained RTP relies heavily on the N-substitution. From poor to moderate to strong donor moieties, the QY increases but suddenly disappears. First-principle calculations reveal that a “sweet spot” for strong NDI RTP exists: while a suitable charge-transfer state can enhance RTP, a strong donor may cause total triplet quenching through the photo-induced electron transfer (PET) mechanism. Furthermore, combining NDI aggregation effects, we realized the reddest RTP ever reported for purely organic materials (Max emission = 675 nm, QY = 21.7%). Given the red emission, respectable QY and oxygen sensitive properties for some of the NDIs, they were tested as imaging agents for in vivo imaging studies.

Sign in / Sign up

Export Citation Format

Share Document