Heavy-Atom-Free Room-Temperature Phosphorescent Organic Light-Emitting Diodes Enabled by Excited States Engineering

2021 ◽  
Author(s):  
Heather F. Higginbotham ◽  
Masato Okazaki ◽  
Piotr de Silva ◽  
Satoshi Minakata ◽  
Youhei Takeda ◽  
...  
Keyword(s):  
Excited States ◽  
Room Temperature ◽  
Light Emitting Diodes ◽  
Heavy Atom ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

scholarly journals Heavy-Atom-Free Room-Temperature Phosphorescent Organic Light-Emitting Diodes Enabled by Excited States Engineering

2020 ◽  
Author(s):  
Heather Higginbotham ◽  
Masato Okazaki ◽  
Piotr de Silva ◽  
Satoshi Minakata ◽  
Youhei Takeda ◽  
...  
Keyword(s):  
Excited States ◽  
Room Temperature ◽  
Light Emitting Diodes ◽  
Heavy Atom ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Room Temperature Phosphorescence ◽  
Host Matrix ◽  
Light Emitting ◽  
Organic Light

Room temperature phosphorescence materials offer great opportunities for applications in optoelectronics, due to their unique photophysical characteristics. However, purely organic emitters that can realize distinct electrophosphorescence are rarely exploited. Herein a new approach for designing heavy-atom-free organic room temperature phosphorescence emitters for organic light-emitting diodes is presented. The subtle tuning of the energy diagrams of singlet and triplet excited states by appropriate choice of host matrix allows tailored emission properties and switching of emission channels between thermally activated delayed fluorescence and room temperature phosphorescence. Moreover, an efficient and heavy-atom-free room temperature phosphorescence organic light-emitting diodes using the developed emitter is realized.

scholarly journals Heavy-Atom-Free Room-Temperature Phosphorescent Organic Light-Emitting Diodes Enabled by Excited States Engineering

2020 ◽  
Author(s):  
Heather Higginbotham ◽  
Masato Okazaki ◽  
Piotr de Silva ◽  
Satoshi Minakata ◽  
Youhei Takeda ◽  
...  
Keyword(s):  
Excited States ◽  
Room Temperature ◽  
Light Emitting Diodes ◽  
Heavy Atom ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Room Temperature Phosphorescence ◽  
Host Matrix ◽  
Light Emitting ◽  
Organic Light

Room temperature phosphorescence materials offer great opportunities for applications in optoelectronics, due to their unique photophysical characteristics. However, purely organic emitters that can realize distinct electrophosphorescence are rarely exploited. Herein a new approach for designing heavy-atom-free organic room temperature phosphorescence emitters for organic light-emitting diodes is presented. The subtle tuning of the energy diagrams of singlet and triplet excited states by appropriate choice of host matrix allows tailored emission properties and switching of emission channels between thermally activated delayed fluorescence and room temperature phosphorescence. Moreover, an efficient and heavy-atom-free room temperature phosphorescence organic light-emitting diodes using the developed emitter is realized.

Room temperature perylene based columnar liquid crystals as solid-state fluorescent emitters in solution-processable organic light-emitting diodes

2020 ◽  
Vol 8 (36) ◽  
pp. 12485-12494 ◽  
Author(s):  
Indu Bala ◽  
Nitya Singh ◽  
Rohit Ashok Kumar Yadav ◽  
Joydip De ◽  
Santosh Prasad Gupta ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Solid State ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Room Temperature ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

Perylene tetraesters based columnar liquid crystal employed as solid-state fluorescent emitter in solution-processed OLEDs and enables to achieve maximum external quantum efficiency of 6.5%.

Towards boosting the exciton lifetime and efficiency of near-infrared aggregation induced emitters with hybridized local and charge transfer excited states: a multiscale study

2019 ◽  
Vol 7 (29) ◽  
pp. 8874-8887 ◽  
Author(s):  
Jianzhong Fan ◽  
Yuchen Zhang ◽  
Kai Zhang ◽  
Jie Liu ◽  
Guanyu Jiang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Luminescence Efficiency ◽  
Exciton Lifetime ◽  
Organic Light ◽  
Promising Application

Fluorescent emitters with long exciton lifetime and high luminescence efficiency show promising application in organic light emitting diodes (OLEDs), especially those with an aggregation induced emission (AIE) feature.

scholarly journals Highly efficient sky blue electroluminescence from ligand-activated copper iodide clusters: Overcoming the limitations of cluster light-emitting diodes

2019 ◽  
Vol 5 (6) ◽  
pp. eaav9857 ◽  
Author(s):  
Mingchen Xie ◽  
Chunmiao Han ◽  
Qianqian Liang ◽  
Jing Zhang ◽  
Guohua Xie ◽  
...  
Keyword(s):  
Excited States ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Molecular Transition ◽  
Optical Applications ◽  
Further Development ◽  
Cluster Unit

Organic light-emitting diodes using cluster emitters have recently emerged as a flexible optoelectronic platform to extend their biological and optical applications. However, their inefficient cluster-centered excited states and deficient electrical properties limit device performance. Here, we introduce donor groups in organic ligands to form ligand-activated clusters, enabling the fabrication of the first cluster-based sky blue–emitting device with a record 30- and 8-fold increased luminance and external quantum efficiency up to ~7000 nits and ~8%, respectively. We show that the electron-donating effect of donor groups can enhance ligand-centered transitions and thoroughly eliminate cluster-centered excited states by delocalizing the molecular transition orbitals from the cluster unit to the ligand, leading to 13-fold increased photoluminescence quantum yield. In turn, the excellent rigidity and photostability of the cluster unit improve the color purity and efficiency stability of the devices. These results will motivate the further development of high-performance optoelectronic clusters by ligand engineering.

Room-Temperature Columnar Liquid Crystalline Materials Based on Pyrazino[2,3-g]quinoxaline for Bright Green Organic Light-Emitting Diodes

2019 ◽  
Vol 1 (9) ◽  
pp. 1959-1969 ◽  
Author(s):  
Vinod Kumar Vishwakarma ◽  
Subrata Nath ◽  
Monika Gupta ◽  
Deepak Kumar Dubey ◽  
Sujith Sudheendran Swayamprabha ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Room Temperature ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Crystalline Materials ◽  
Organic Light ◽  
Bright Green ◽  
Liquid Crystalline Materials
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