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

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.

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.

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.

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%.

One-dimensional π–π stacking induces highly efficient pure organic room-temperature phosphorescence and ternary-emission single-molecule white light

2019 ◽  
Vol 7 (40) ◽  
pp. 12502-12508 ◽  
Author(s):  
Yating Wen ◽  
Haichao Liu ◽  
Shitong Zhang ◽  
Yu Gao ◽  
Yan Yan ◽  
...  
Keyword(s):  
Single Molecule ◽  
White Light ◽  
Room Temperature ◽  
High Efficiency ◽  
Intersystem Crossing ◽  
Room Temperature Phosphorescence ◽  
One Dimensional ◽  
Highly Efficient ◽  
Π Stacking ◽  
Radiative Rate

High-efficiency RTP of TX-Cl crystal was induced by one-dimensional π–π stacking, which significantly enhances both intersystem crossing (S1 → Tn) and radiative rate (T1 → S0). SMWLE was harvested by precisely controlling aggregating degree.

scholarly journals Engendering persistent organic room temperature phosphorescence by trace ingredient incorporation

2021 ◽  
Vol 7 (19) ◽  
pp. eabf9668
Author(s):  
Bingbing Ding ◽  
Liangwei Ma ◽  
Zizhao Huang ◽  
Xiang Ma ◽  
He Tian
Keyword(s):  
Room Temperature ◽  
High Efficiency ◽  
Optoelectronic Devices ◽  
Luminescence Properties ◽  
Quantum Yields ◽  
Room Temperature Phosphorescence ◽  
Trace Impurities ◽  
Mole Percent ◽  
Flexible Application ◽  
Incorporation Method

Pure organic persistent room temperature phosphorescence (RTP) has shown great potential in information encryption, optoelectronic devices, and bio-applications. However, trace impurities are generated in synthesis, causing unpredictable effects on the luminescence properties. Here, an impurity is isolated from a pure organic RTP system and structurally characterized that caused an unusual ultralong RTP in matrix even at 0.01 mole percent content. Inspired by this effect, a series of compounds are screened out to form the bicomponent RTP system by the trace ingredient incorporation method. The RTP quantum yields reach as high as 74.2%, and the lifetimes reach up to 430 ms. Flexible application of trace ingredients to construct RTP materials has become an eye-catching strategy with high efficiency, economy, and potential for applications as well as easy preparation.

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