Achieving high-efficiency purely organic room-temperature phosphorescence materials by boronic ester substitution of phenoxathiine

2019 ◽  
Vol 55 (50) ◽  
pp. 7215-7218 ◽  
Author(s):  
Mengke Li ◽  
Xinyi Cai ◽  
Zhenyang Qiao ◽  
Kunkun Liu ◽  
Wentao Xie ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Room Temperature ◽  
High Efficiency ◽  
Room Temperature Phosphorescence ◽  
Boronic Ester

The effect of boronic ester substitution on the room-temperature phosphorescence of phenoxathiine-based derivatives was investigated to achieve an improved phosphorescence quantum efficiency of up to 20%.

Clustering-Triggered Efficient Room Temperature Phosphorescence from Nonconventional Luminophores

2019 ◽  
Author(s):  
Shuyuan Zheng ◽  
Taiping Hu ◽  
Xin Bin ◽  
Yunzhong Wang ◽  
Yuanping Yi ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Efficiency ◽  
Spin Orbit Coupling ◽  
Design Rationale ◽  
Emission Mechanism ◽  
Room Temperature Phosphorescence ◽  
Electronic Interactions ◽  
Energy Gaps ◽  
Theoretical Results

Pure organic room temperature phosphorescence (RTP) and luminescence from nonconventional luminophores have gained increasing attention. However, it remains challenging to achieve efficient RTP from unorthodox luminophores, on account of the unsophisticated understanding of the emission mechanism. Here we propose a strategy to realize efficient RTP in nonconventional luminophores through incorporation of lone pairs together with clustering and effective electronic interactions. The former promotes spin-orbit coupling and boost the consequent intersystem crossing, whereas the latter narrows energy gaps and stabilizes the triplets, thus synergistically affording remarkable RTP. Experimental and theoretical results of urea and its derivatives verify the design rationale. Remarkably, RTP from thiourea solids with unprecedentedly high efficiency of up to 24.5% is obtained. Further control experiments testify the crucial role of through-space delocalization on the emission. These results would spur the future fabrication of nonconventional phosphors, and moreover should advance understanding of the underlying emission mechanism.<br>

Pure room temperature phosphorescence emission of organic host-guest doped system with quantum efficiency of 64%

2021 ◽  
Author(s):  
Xiaoqing Liu ◽  
Wenbo Dai ◽  
Qian Junjie ◽  
Yunxiang Lei ◽  
Miaochang Liu ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Room Temperature ◽  
Room Temperature Phosphorescence ◽  
Halogen Atoms ◽  
System P ◽  
Phosphorescence Emission

A new doped system with pure phosphorescent emission is constructed using four 1-(4-(diphenylamino)phenyl)-2-phenylethan-1-one derivatives containing halogen atoms as the guests and benzophenone as the host. That is, the doped system...

scholarly journals Highly Efficient Heavy Atom Free Room Temperature Phosphorescence by Host-Guest Doping

2021 ◽  
Vol 9 ◽  
Author(s):  
Jinzhu Cao ◽  
Meng Zhang ◽  
Manjeet Singh ◽  
Zhongfu An ◽  
Lingfei Ji ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Room Temperature ◽  
Heavy Atom ◽  
Molar Ratio ◽  
Ambient Conditions ◽  
Room Temperature Phosphorescence ◽  
Highly Efficient ◽  
Long Lifetime ◽  
Remarkable Progress

Recently, there has been remarkable progress of the host-guest doped pure organic room-temperature phosphorescence (RTP) materials. However, it remains a great challenge to develop highly efficient host-guest doping systems. In this study, we have successfully developed a heavy atom free pure organic molecular doped system (benzophenone-thianthrene, respectively) with efficient RTP through a simple host-guest doping strategy. Furthermore, by optimizing the doping ratios, the host-guest material with a molar ratio of 100:1 presented an efficient RTP emission with 46% quantum efficiency and a long lifetime of up to 9.17 ms under ambient conditions. This work will provide an effective way to design new organic doping systems with RTP.

scholarly journals Ultralong UV/mechano-excited room temperature phosphorescence from purely organic cluster excitons

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Xuepeng Zhang ◽  
Lili Du ◽  
Weijun Zhao ◽  
Zheng Zhao ◽  
Yu Xiong ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Efficiency ◽  
Transient Absorption ◽  
Transient State ◽  
Exciton Model ◽  
Room Temperature Phosphorescence ◽  
Naphthalic Anhydride ◽  
Femtosecond Transient Absorption ◽  
Organic Solid ◽  
Absorption Studies

AbstractPurely organic room temperature phosphorescence (RTP) has attracted wide attention recently due to its various application potentials. However, ultralong RTP (URTP) with high efficiency is still rarely achieved. Herein, by dissolving 1,8-naphthalic anhydride in certain organic solid hosts, URTP with a lifetime of over 600 ms and overall quantum yield of over 20% is realized. Meanwhile, the URTP can also be achieved by mechanical excitation when the host is mechanoluminescent. Femtosecond transient absorption studies reveal that intersystem crossing of the host is accelerated substantially in the presence of a trace amount of 1,8-naphthalic anhydride. Accordingly, we propose that a cluster exciton spanning the host and guest forms as a transient state before the guest acts as an energy trap for the RTP state. The cluster exciton model proposed here is expected to help expand the varieties of purely organic URTP materials based on an advanced understanding of guest/host combinations.

A high efficiency pure organic room temperature phosphorescence polymer PPV derivative for OLED

2019 ◽  
Vol 64 ◽  
pp. 247-251 ◽  
Author(s):  
Ying He ◽  
Nianhe Cheng ◽  
Xin Xu ◽  
Jiawei Fu ◽  
Jun-an Wang
Keyword(s):  
Room Temperature ◽  
High Efficiency ◽  
Room Temperature Phosphorescence

D–A–D-type bipolar host materials with room temperature phosphorescence for high-efficiency green phosphorescent organic light-emitting diodes

2020 ◽  
Vol 8 (5) ◽  
pp. 1871-1878 ◽  
Author(s):  
Fei Wang ◽  
Jing Sun ◽  
Mingli Liu ◽  
Huifang Shi ◽  
Huili Ma ◽  
...  
Keyword(s):  
Carrier Transport ◽  
Room Temperature ◽  
High Efficiency ◽  
Organic Light Emitting Diodes ◽  
Room Temperature Phosphorescence ◽  
Light Emitting ◽  
Molecular Arrangement ◽  
Organic Light ◽  
Host Materials ◽  
High Efficient

Bipolar host materials with D–A architectures play an important role in the high efficient PhOLEDs owing to the excellent carrier transport capability, which could be optimized by tight and regular molecular arrangement.

Enhancing the phosphorescence of hybrid metal halides through molecular sensitization

2019 ◽  
Vol 7 (32) ◽  
pp. 9803-9807 ◽  
Author(s):  
Liao-Kuo Gong ◽  
Jian-Rong Li ◽  
Zhao-Feng Wu ◽  
Bing Hu ◽  
Ze-Ping Wang ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Room Temperature ◽  
Metal Halides ◽  
Room Temperature Phosphorescence

The room-temperature phosphorescence quantum efficiency of [BPy]6[Pb3Br12] has been improved by a maximum of fourteen-fold through sensitization of thiadiazole-based molecules.

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