Novel blue fluorescent materials for high-performance nondoped blue OLEDs and hybrid pure white OLEDs with ultrahigh color rendering index

Liu, Futong; Liu, Hui; Tang, Xiangyang; Ren, Shenghong; He, Xin; Li, Jinyu; Du, Chunya; Feng, Zijun; Lü, Ping

doi:10.1016/j.nanoen.2019.104325

Cited by 73 publications

(35 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electrochemical property revealed carrier injection and transport properties, which was important to design the OLED device structure. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) were calculated by the following equation [ 36 , 37 ]: HOMO (eV) = −[E ox − E(Fc/Fc + ) + 4.8] LUMO (eV) = −[E red − E(Fc/Fc − ) + 4.8] …”

Section: Resultsmentioning

confidence: 99%

A Novel Deep Blue LE-Dominated HLCT Excited State Design Strategy and Material for OLED

et al. 2021

View full text Add to dashboard Cite

Deep blue luminescent materials play a crucial role in the organic light-emitting diodes (OLEDs). In this work, a novel deep blue molecule based on hybridized local and charge-transfer (HLCT) excited state was reported with the emission wavelength of 423 nm. The OLED based on this material achieved high maximum external quantum efficiency (EQE) of 4% with good color purity. The results revealed that the locally-excited (LE)-dominated HLCT excited state had obvious advantages in short wavelength and narrow spectrum emission. What is more, the experimental and theoretical combination was used to describe the excited state characteristic and to understand photophysical property.

show abstract

Section: Resultsmentioning

confidence: 99%

A Novel Deep Blue LE-Dominated HLCT Excited State Design Strategy and Material for OLED

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In our previous works, imidazole was an ideal unit for blue-emitting materials owing to its high η PL and bipolar transport characteristics. 36,[42][43][44][53][54][55] It tends to be a weak electron-withdrawing substituent when linked to a stronger D but acts as a weak electron donator otherwise. 42,51 Pyrene [4,5-d]imidazole is thus chosen as the weak D and obtained by creating a melt of pyrene and imidazole.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Blue Organic Light-Emitting Diode Based on a Pyrene[4,5- d ]Imidazole-Pyrene Molecule

et al. 2022

Self Cite

View full text Add to dashboard Cite

Organic light-emitting diodes (OLEDs), which have been recently utilized in some flat-panel display screens such as mobile phones and televisions, show many merits, including light weight, high flexibility, energy preservation, and so forth, and are considered the next-generation displays and solid-state lightings. Blue-emitting materials that can be applied in nondoped OLEDs with little efficiency roll-offs at high brightness are of great importance. Here, a highly efficient, blue-emitting material, 9-phenyl-10-(4-(pyren-1-yl)phenyl)-9H-pyreno [4,5-d]imidazole (PyPI-Py), is achieved using pyrene [4,5-d]imidazole and pyrene as the weak electron donor and electron acceptor, respectively. The nondoped blue OLED exhibits excellent performance with a maximum brightness of 75,687 cd m −2 , a maximum current efficiency of 13.38 cd A −1 , and a maximum external quantum efficiency (η ext ) of 8.52%. Moreover, the η ext is maintained at 8.35% and 8.05% at a brightness of 10,000 and 50,000 cd m −2 , respectively, displaying extremely small efficiency roll-offs of 2.0% and 5.5%.The device characteristics are among the highest values for nondoped blue OLEDs and correspond to the best performance obtained for nondoped pyrene-based blue OLEDs. The superior performance is attributed to the proper donor-acceptor design strategy which results in a quasi-equivalent hybrid local and charge-transfer excited state with the maximum generation of an 82% fraction of singlet excitons.

show abstract

“…The emitters used in OLEDs could be divided into three classes in general: traditional fluorescent materials, phosphorescent materials and thermally activated delayed fluorescence (TADF) materials. [1][2][3] Among them, the TADF materials have become the focus in recent years because of the advantages of high efficiency with B100% internal quantum efficiency (IQE), 4 low cost with pure fluorescent materials 5 and green/sustainable development without heavy metals. 6 A series of high efficiency TADF emitters with blue, green, orange and red emissions had been explored in the past decade.…”

Section: Introductionmentioning

confidence: 99%

Diluted exciplex concentrations in organic light emitting diodes for blue-shifted spectra and improved efficiency

Yan

Dong

et al. 2022

J. Mater. Chem. C

View full text Add to dashboard Cite

show abstract

Novel blue fluorescent materials for high-performance nondoped blue OLEDs and hybrid pure white OLEDs with ultrahigh color rendering index

Cited by 73 publications

References 58 publications

A Novel Deep Blue LE-Dominated HLCT Excited State Design Strategy and Material for OLED

A Novel Deep Blue LE-Dominated HLCT Excited State Design Strategy and Material for OLED

Highly Efficient Blue Organic Light-Emitting Diode Based on a Pyrene[4,5- d ]Imidazole-Pyrene Molecule

Diluted exciplex concentrations in organic light emitting diodes for blue-shifted spectra and improved efficiency

Contact Info

Product

Resources

About