Superior upconversion fluorescence dopants for highly efficient deep-blue electroluminescent devices

Chemical Science
Yi-Hsiang ChenChien-Hong Cheng

Abstract

In this study, we revealed a new approach for the development of new triplet-triplet annihilation (TTA) materials with highly efficient deep-blue fluorescence via the incorporation of a styrylpyrene core and an electron-donating group. The resulting deep-blue emitters (PCzSP, DFASP, and DPASP) exhibit intramolecular charge transfer emissions with remarkably high emission quantum yields. The electroluminescent devices based on these three fluorophores as dopants using CBP as a host exhibit very high device efficiencies; in particular, the DPASP-doped device reveals an extremely high EQE of 12%, reaching the limit of a TTA-based device. The EL characteristics of DPASP-doped CBP-based devices at various doping concentrations (0-5%) suggest that the dopant DPASP is responsible for the TTA-type delayed fluorescence in the device; no delayed fluorescence was observed for the device using CBP as the host emitter. Moreover, when using DMPPP with ambipolar characteristics as the host, the deep-blue DPASP-doped device also gives outstanding performance with an EQE of nearly 11% with an extremely small efficiency roll-off, which was ascribed to the excellent charge balance in the emitting layer of the EL device. The TTA process of the SP-...Continue Reading

References

Oct 6, 2006·The Journal of Physical Chemistry. a·Wei Zhao, Felix N Castellano
May 8, 2010·Chemical Society Reviews·Hongbin WuYong Cao
Jul 30, 2011·Chemical Society Reviews·Yuning HongBen Zhong Tang
Aug 31, 2012·Journal of the American Chemical Society·Qisheng ZhangChihaya Adachi
Dec 14, 2012·Nature·Hiroki UoyamaChihaya Adachi
May 20, 2014·Chemical Communications : Chem Comm·P-Y ChouC-H Cheng
Dec 11, 2014·Chemical Reviews·Jing ZhouFuyou Li
Sep 15, 2015·Journal of the American Chemical Society·Katsuaki KawasumiTimothy M Swager

❮ Previous
Next ❯

Citations

Jan 3, 2020·Physical Chemistry Chemical Physics : PCCP·Chen YeKarl Börjesson
Sep 3, 2020·The Journal of Chemical Physics·Alexander S BieberLea Nienhaus
Aug 17, 2019·Chemical Society Reviews·Babak PashaeiFrancesco Bonaccorso
Nov 25, 2020·Chemical Society Reviews·Yuwei XuYuguang Ma
Sep 21, 2016·ACS Applied Materials & Interfaces·Pachaiyappan RajamalliChien-Hong Cheng

❮ Previous
Next ❯

Methods Mentioned

BETA
differential scanning calorimetry
phosphorescence

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.