Highly efficient orange and white OLEDs based on ultrathin phosphorescent emitters with double reverse intersystem crossing system

Sheng, Ren; Yang, Liping; Li, Asu; Chen, Keming; Zhang, Fujun; Duan, Yu; Zhao, Yi; Chen, Ping

doi:10.1016/j.jlumin.2022.118852

Cited by 14 publications

(8 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…White light emission can be obtained by doping multiple dyes into one single EML or by using multiple EMLs [ 24 , 25 , 26 , 27 , 28 ]. However, doping is a sophisticated device fabrication process where it is difficult to precisely control the relative concentration of guest/host doping, especially for white OLEDs.…”

Section: Resultsmentioning

confidence: 99%

High-Efficiency Simplified Orange and White Organic Light-Emitting Devices Based on a Platinum(II) Complex

Zhao

Zhang

2022

Micromachines

View full text Add to dashboard Cite

We demonstrated efficient simplified orange and white organic light-emitting devices based on a platinum(II) complex Tetra-Pt-N. The maximum current efficiency achieved from the optimized orange device was 57.6 cd/A. The emission mechanism for the system of Tetra-Pt-N doped into 4,4’-bis(arbazole-9-yl)biphenyl was discussed. Moreover, a high-efficiency and simplified white device was fabricated by introducing an ultra-thin blue phosphorescent emission layer. The white device with a maximum current efficiency of 41.9 cd/A showed excellent stable spectra and low efficiency roll-off.

show abstract

Section: Resultsmentioning

confidence: 99%

High-Efficiency Simplified Orange and White Organic Light-Emitting Devices Based on a Platinum(II) Complex

Zhao

Zhang

2022

Micromachines

View full text Add to dashboard Cite

show abstract

“…Unlike the first generation of fluorescent materials with 25% lower exciton utilization and the second generation of phosphorescent materials that use heavy metals to increase spin–orbit coupling, the third generation of TADF materials have become the “new star” in the OLED field with their effective reverse intersystem crossing (RISC) to achieve 100% internal quantum efficiency and environmental friendliness without the use of any heavy metals. Although many TADF emitters using the vacuum vapor deposition process for device preparation have been reported so far, − the solution-processing technique for device preparation has more significant advantages in terms of low cost, low energy consumption, low consumables, and simple devices compared to vacuum vapor deposition. − In this context, polymeric materials are receiving more and more attention due to their good solubility and morphological stability suitable for solution-processable as well as flexible device preparation.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the In Situ and Solvent Polymerization Engineering for Highly Efficient and Flexible Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes

Zhou,

Zhang,

Cao

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Thermally activated delayed fluorescence (TADF) polymer has great potential for the construction of flexible solution-processed organic light-emitting diodes (OLEDs). However, the relationship between polymerization engineering and device functions has rarely been reported. Here, two novel TADF polymers, P-Ph4CzCN and P-Ph5CzCN, with a small energy gap between the first excited singlet and triplet states (ΔE ST ; <0.16 eV) were newly developed by both solvent and in situ polymerization of a styrene component. Detailed device performance testing indicates that both polymerization strategies ensure that the TADF polymer achieves comparable high efficiencies in commonly rigid devices, and the maximum external quantum efficiencies (EQE max ) were 11.9%, 14.1%, and 16.2% for blue, green, and white OLEDs, respectively. Although in situ polymerization provides a simplified device fabrication process, which avoids the complicated synthesis and purification of the polymer, the inevitable hightemperature annealing makes it fail in a plastic substrate device. In contrast, P-Ph5CzCN achieved by solvent polymerization enables the successful fabrication of a flexible device on a poly(ethylene terephthalate) (PET) substrate, which was the first reported flexible OLED based on a TADF polymer. This work provides a strong guideline for the simple fabrication of TADF polymer devices and the application of TADF polymer materials in OLED flexible panels and flexible lighting.

show abstract

“…LCDs have now become so widespread throughout the world that our lives today would not be possible without them, including their use in smartphones, laptops, and digital camera monitors 1–3 . LCD technology has made great progress over the past several years, creating new products one after another 4–8 . Advancements in mounting technology for forming large‐scale integration circuit boards have been essential to the evolution of these displays.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] LCD technology has made great progress over the past several years, creating new products one after another. [4][5][6][7][8] Advancements in mounting technology for forming large-scale integration circuit boards have been essential to the evolution of these displays.…”

Section: Introductionmentioning

confidence: 99%

Mechanical stability and insulation reliability of polymeric layers constructed by thermal fusion of polymer shell particles heterocoagulated on conductivenickel‐platedcore particles

Naruhashi

Aoki

Taniguchi

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this study, the mechanical stability and insulating reliability of polymeric layers constructed on the surface of nickel‐plated particles for anisotropic conductive films were measured by means of a microcompression test. The polymeric layers were constructed by heterocoagulation between the nickel‐plated core particles and the polymeric shell particles and successive thermal fusion. Uniform core‐shell particles with a coverage of approximately 60%–70% were prepared at NaCl concentrations near the critical coagulation concentrations of the shell particles. Continuous polymeric layers were successfully formed by heating the heterocoagulates at a temperature slightly higher than the glass transition temperature of the shell particles. The microcompression test was applied to measure the compression displacement until the heterocoagulates were electrically connected. The larger the shell particles and the higher the coverage of heterocoagualtes, the greater the displacement, reaching a maximum displacement of 0.72 μm for heterocoagulates with shell particles of 217 nm before heating. Heating the heterocoagulates and thermally melting adjacent shell particles could further improve the insulating properties of polymeric layer. Thermal melting of shell particles of heterocoagulates with a coverage more than 60% by 152 or 217 nm shells resulted in the disappearance of zero‐point conductive particles.

show abstract

Highly efficient orange and white OLEDs based on ultrathin phosphorescent emitters with double reverse intersystem crossing system

Cited by 14 publications

References 40 publications

High-Efficiency Simplified Orange and White Organic Light-Emitting Devices Based on a Platinum(II) Complex

High-Efficiency Simplified Orange and White Organic Light-Emitting Devices Based on a Platinum(II) Complex

Unveiling the In Situ and Solvent Polymerization Engineering for Highly Efficient and Flexible Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes

Mechanical stability and insulation reliability of polymeric layers constructed by thermal fusion of polymer shell particles heterocoagulated on conductivenickel‐platedcore particles

Contact Info

Product

Resources

About