Tunable lifetimes and efficiencies of room temperature phosphorescent liquids by modulating the length and number of alkyl chains

2020 ◽  
Vol 22 (35) ◽  
pp. 19746-19757
Author(s):  
Yuchen Zhang ◽  
Kai Zhang ◽  
Yuying Ma ◽  
Lili Lin ◽  
Chuan-Kui Wang ◽  
...  
Keyword(s):  
Organic Solvent ◽  
Room Temperature ◽  
High Efficiency ◽  
Solvent Free ◽  
Large Area ◽  
Room Temperature Phosphorescence ◽  
Alkyl Chains ◽  
Liquid Systems

Organic room temperature phosphorescence (RTP) liquid composites exhibit the potential to make innovative changes in large area flexible lighting applications, and it is extremely challenging to achieve high-efficiency RTP in pure organic solvent-free liquid systems.

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>

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

Efficient and selective copper-catalyzed organic solvent-free and biphasic oxidation of aromatic gem-disubstituted alkenes to carbonyl compounds by tert-butyl hydroperoxide at room temperature

2014 ◽  
Vol 16 (6) ◽  
pp. 3013-3017 ◽  
Author(s):  
Md. Munkir Hossain ◽  
Wei-Kai Huang ◽  
Hung-Jie Chen ◽  
Pei-Han Wang ◽  
Shin-Guang Shyu
Keyword(s):  
Organic Solvent ◽  
Carbonyl Compounds ◽  
Room Temperature ◽  
Oxidative Cleavage ◽  
Solvent Free ◽  
Butyl Hydroperoxide ◽  
Tert Butyl ◽  
Tert Butyl Hydroperoxide

Biphasic Cu(ii) catalyzed selective oxidative cleavage of aromatic gem-disubstituted alkenes to carbonyl compounds using tert-butyl hydroperoxide at room temperature.

scholarly journals Size control of magnetite nanoparticles by organic solvent-free chemical coprecipitation at room temperature

2010 ◽  
Vol 5 (3) ◽  
pp. 251-262 ◽  
Author(s):  
Tomohiro Iwasaki ◽  
Naoya Mizutani ◽  
Satoru Watano ◽  
Takeshi Yanagida ◽  
Tomoji Kawai
Keyword(s):  
Organic Solvent ◽  
Magnetite Nanoparticles ◽  
Room Temperature ◽  
Size Control ◽  
Solvent Free ◽  
Chemical Coprecipitation

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.

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%.

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