scholarly journals Two-photon-excited ultralong organic room temperature phosphorescence by dual-channel triplet harvesting

2019 ◽  
Vol 10 (31) ◽  
pp. 7352-7357 ◽  
Author(s):  
Zhu Mao ◽  
Zhan Yang ◽  
Chao Xu ◽  
Zongliang Xie ◽  
Long Jiang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Energy Gap ◽  
Infrared Laser ◽  
Concentration Quenching ◽  
Ambient Conditions ◽  
Room Temperature Phosphorescence ◽  
Small Energy ◽  
Two Photon ◽  
Dual Channel ◽  
Triplet Harvesting

Small energy gap boosts dual-channel triplet harvesting via TADF and UOP, which suppresses long-lived triplet concentration quenching. An infrared laser (808 nm) is able to induce persistent emission under ambient conditions.

scholarly journals Near-Infrared-Excitable Organic Ultralong Phosphorescence through Multiphoton Absorption

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Ye Tao ◽  
Lele Tang ◽  
Qi Wei ◽  
Jibiao Jin ◽  
Wenbo Hu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Emission Feature ◽  
Multiphoton Absorption ◽  
Triplet Excited State ◽  
Room Temperature Phosphorescence ◽  
Two Photon ◽  
Nir Light ◽  
Phosphorescence Quantum Yield ◽  
Novel Applications

Organic ultralong room-temperature phosphorescence (OURTP) with a long-lived triplet excited state up to several seconds has triggered widespread research interests, but most OURTP materials are excited by only ultraviolet (UV) or blue light owing to their unique stabilized triplet- and solid-state emission feature. Here, we demonstrate that near-infrared- (NIR-) excitable OURTP molecules can be rationally designed by implanting intra/intermolecular charge transfer (CT) characteristics into H-aggregation to stimulate the efficient nonlinear multiphoton absorption (MPA). The resultant upconverted MPA-OURTP show ultralong lifetimes over 0.42 s and a phosphorescence quantum yield of ~37% under both UV and NIR light irradiation. Empowered by the extraordinary MPA-OURTP, novel applications including two-photon bioimaging, visual laser power detection and excitation, and lifetime multiplexing encryption devices were successfully realized. These discoveries illustrate not only a delicate design map for the construction of NIR-excitable OURTP materials but also insightful guidance for exploring OURTP-based nonlinear optoelectronic properties and applications.

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 Guest-host doped strategy for constructing ultralong-lifetime near-infrared organic phosphorescence materials for bioimaging

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Fuming Xiao ◽  
Heqi Gao ◽  
Yunxiang Lei ◽  
Wenbo Dai ◽  
Miaochang Liu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Tumor Imaging ◽  
Energy Gap ◽  
Radiative Transition ◽  
Room Temperature Phosphorescence ◽  
Triplet Energy ◽  
Long Wavelength ◽  
Long Lifetime ◽  
First Time

AbstractOrganic near-infrared room temperature phosphorescence materials have unparalleled advantages in bioimaging due to their excellent penetrability. However, limited by the energy gap law, the near-infrared phosphorescence materials (>650 nm) are very rare, moreover, the phosphorescence lifetimes of these materials are very short. In this work, we have obtained organic room temperature phosphorescence materials with long wavelengths (600/657–681/732 nm) and long lifetimes (102–324 ms) for the first time through the guest-host doped strategy. The guest molecule has sufficient conjugation to reduce the lowest triplet energy level and the host assists the guest in exciton transfer and inhibits the non-radiative transition of guest excitons. These materials exhibit good tissue penetration in bioimaging. Thanks to the characteristic of long lifetime and long wavelength emissive phosphorescence materials, the tumor imaging in living mice with a signal to background ratio value as high as 43 is successfully realized. This work provides a practical solution for the construction of organic phosphorescence materials with both long wavelengths and long lifetimes.

Tuning the singlet–triplet energy gap of AIE luminogens: crystallization-induced room temperature phosphorescence and delay fluorescence, tunable temperature response, highly efficient non-doped organic light-emitting diodes

2015 ◽  
Vol 17 (2) ◽  
pp. 1134-1141 ◽  
Author(s):  
Jie Li ◽  
Yibin Jiang ◽  
Juan Cheng ◽  
Yilin Zhang ◽  
Huimin Su ◽  
...  
Keyword(s):  
Room Temperature ◽  
Light Emitting Diodes ◽  
Energy Gap ◽  
Temperature Response ◽  
Organic Light Emitting Diodes ◽  
Room Temperature Phosphorescence ◽  
Triplet Energy ◽  
Light Emitting ◽  
Organic Light ◽  
Delay Fluorescence

Tuning singlet–triplet energy gap of AIE luminogens: crystallization-induced phosphorescence, delay fluorescence and efficient non-doped OLEDs.

Anion-regulated transient and persistent phosphorescence and size-dependent ultralong afterglow of organic ionic crystals

2019 ◽  
Vol 7 (46) ◽  
pp. 14535-14542 ◽  
Author(s):  
Guilin Chen ◽  
Sidan Guo ◽  
Hui Feng ◽  
Zhaosheng Qian
Keyword(s):  
Room Temperature ◽  
Organic Crystals ◽  
Ionic Crystals ◽  
Ambient Conditions ◽  
Room Temperature Phosphorescence ◽  
Size Dependent

Regulation and the transient and persistent room-temperature phosphorescence of organic ionic crystals by the alteration of anions, and unique size-dependent ultralong afterglow of specific organic crystals under ambient conditions were reported.

scholarly journals Thermochemically Stable Liquid-Crystalline Gold(I) Complexes Showing Enhanced Room Temperature Phosphorescence

Crystals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 227 ◽  
Author(s):  
Yuki Kuroda ◽  
Shin-ya Nakamura ◽  
Katam Srinivas ◽  
Arruri Sathyanarayana ◽  
Ganesan Prabusankar ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Rational Design ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
Decomposition Temperature ◽  
Ambient Conditions ◽  
Room Temperature Phosphorescence ◽  
Light Emitting ◽  
Phosphorescence Quantum Yield ◽  
Thermochemical Stability

Gold(I) complexes are some of the most attractive materials for generating aggregation-induced emission (AIE), enabling the realization of novel light-emitting applications such as chemo-sensors, bio-sensors, cell imaging, and organic light-emitting diodes (OLEDs). In this study, we propose a rational design of luminescent gold complexes to achieve both high thermochemical stability and intense room temperature phosphorescence, which are desirable features in practical luminescent applications. Here, a series of gold(I) complexes with ligands of N-heterocyclic carbene (NHC) derivatives and/or acetylide were synthesized. Detailed characterization revealed that the incorporation of NHC ligands could increase the molecular thermochemical stability, as the decomposition temperature was increased to ~300 °C. We demonstrate that incorporation of both NHC and acetylide ligands enables us to generate gold(I) complexes exhibiting both high thermochemical stability and high room-temperature phosphorescence quantum yield (>40%) under ambient conditions. Furthermore, we modified the length of alkoxy chains at ligands, and succeeded in synthesizing a liquid crystalline gold(I) complex while maintaining the relatively high thermochemical stability and quantum yield.

Tunable Full-color Room Temperature Phosphorescence of Two Single-Component Zinc(II) Complexes

2021 ◽  
Author(s):  
Ying Mu ◽  
Zhongxin Liu ◽  
Xiaoyu Fang ◽  
Song-De Han ◽  
Jie Pan ◽  
...  
Keyword(s):  
Room Temperature ◽  
Heavy Atom ◽  
Photoluminescence Property ◽  
Single Component ◽  
Ambient Conditions ◽  
Room Temperature Phosphorescence ◽  
Full Color ◽  
Color Displays ◽  
Organic Complexes ◽  
Yellow Orange

Abstract Tunable full-color room temperature phosphorescence (RTP) is charming due to its potentials in multiple anti-counterfeitings, all-color displays, and multichannel biomarkers. However, it is a huge challenge to acquire excitation-dependent continuously adjustable full-color RTP from a single-component compound. Herein, we report two Zn(II)−based organic complexes, which are the first examples that present blue, cyan, green, yellow, orange, and red continuously tunable phosphorescence with decent quantum efficiency in response to variation of excitation energy at ambient conditions. The unique photoluminescence property is induced by multiple triplet decay pathways, i.e. 3ligand-centered* and 3charge transfer*. The population and stabilization of the triplet excitons benefit from heavy atom effect of Br ions and restriction of molecular motion due to crystallization. This work contributes an insight for the construction of full-color RTP materials and endows Zn(II)−based organic complexes with fresh features for extensive applications.

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