Stretchable Batteries: Stand‐Alone Intrinsically Stretchable Electronic Device Platform Powered by Stretchable Rechargeable Battery (Adv. Funct. Mater. 50/2020)

Song, Woo‐Jin; Kong, Minsik; Cho, Sung-Hwan; Lee, Sangyeop; Kwon, Jung‐Dae; Son, Hye Bin; Song, Jun Hyuk; Song, Gyujin; Lee, Sang Young; Jung, Sungjune; Park, Soo‐Jin; Jeong, Unyong

doi:10.1002/adfm.202070328

Cited by 24 publications

(32 citation statements)

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“…However, the operational lifetime of deep‐blue Ph‐ and TADF‐OLEDs remains insufficiently short, preventing their practical use in display and lighting applications. [ 5,6 ]…”

Section: Introductionmentioning

confidence: 99%

Improved Efficiency and Lifetime of Deep‐Blue Hyperfluorescent Organic Light‐Emitting Diode using Pt(II) Complex as Phosphorescent Sensitizer

et al. 2021

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Although the organic light‐emitting diode (OLED) has been successfully commercialized, the development of deep‐blue OLEDs with high efficiency and long lifetime remains a challenge. Here, a novel hyperfluorescent OLED that incorporates the Pt(II) complex (PtON7‐dtb) as a phosphorescent sensitizer and a hydrocarbon‐based and multiple resonance‐based fluorophore as an emitter (TBPDP and ν‐DABNA) in the device emissive layer (EML), is proposed. Such an EML system can promote efficient energy transfer from the triplet excited states of the sensitizer to the singlet excited states of the fluorophore, thus significantly improving the efficiency and lifetime of the device. As a result, a deep‐blue hyperfluorescent OLED using a multiple resonance‐based fluorophore (ν‐DABNA) with Commission Internationale de L'Eclairage chromaticity coordinate y below 0.1 is demonstrated, which attains a narrow full width at half maximum of ≈17 nm, fourfold increased maximum current efficiency of 48.9 cd A−1, and 19‐fold improved half‐lifetime of 253.8 h at 1000 cd m−2 compared to a conventional phosphorescent OLED. The findings can lead to better understanding of the hyperfluorescent OLEDs with high performance.

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“…However, the operational lifetime of deep‐blue Ph‐ and TADF‐OLEDs remains insufficiently short, preventing their practical use in display and lighting applications. [ 5,6 ]…”

Section: Introductionmentioning

confidence: 99%

Improved Efficiency and Lifetime of Deep‐Blue Hyperfluorescent Organic Light‐Emitting Diode using Pt(II) Complex as Phosphorescent Sensitizer

et al. 2021

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“…Despite being conceptually easy, it proved difficult to find rational ways of inhibiting the degradation to increase operational lifetime and efficiency. [ 20–22 ] A number of factors such as structural degradation, [ 23–25 ] triplet‐polaron, [ 26–27 ] and triplet‐triplet annihilation [ 28–30 ] have been considered as potential causes of these inefficiencies, but much remains unclear and a unified strategy for systematically increasing the performance of blue emitters has not emerged. One of the main difficulties in developing systematic strategies lies in the fact that little is known about what causes the loss in activity at the molecular level and a quantitative structure‐reactivity relationship could not be established thus far.…”

Section: Introductionmentioning

confidence: 99%

“…Ligands were decorated with cyano groups [ 40 ] and pyrimidine moieties were introduced. Fluorine‐free, homoleptic phenylimidazole‐based Ir(III) dopants showed promising performance, [ 24,41 ] but the improvement in OLED device lifetimes were only moderate.…”

Section: Introductionmentioning

confidence: 99%

Protecting Benzylic CH Bonds by Deuteration Doubles the Operational Lifetime of Deep‐Blue Ir‐Phenylimidazole Dopants in Phosphorescent OLEDs

Bae

Kim

Yakubovich

et al. 2021

Advanced Optical Materials

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Much effort has been dedicated to increase the operational lifetime of blue phosphorescent materials in organic light-emitting diodes (OLEDs), but the reported device lifetimes are still too short for the industrial applications. An attractive method for increasing the lifetime of a given emitter without making any chemical change is exploiting the kinetic isotope effect, where key C-H bonds are deuterated. A computer model identi ed that the most vulnerable molecular site in an Ir-phenylimidazole dopant is the benzylic C-H bond and predicted that deuteration may lower the deactivation pathway involving C-H/D cleavage notably. Experiments showed that the device lifetime (T 70 ) of a prototype phosphorescent OLED device could be doubled to 355 hours with a maximum external quantum e ciency of 25.1% at 1000 cd/m 2 . This is one of the best operational performances of blue phosphorescent OLEDs observed to date in a single stacked cell.

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“…Therefore, to realize high‐efficiency and long‐life OLEDs, one of the most important components is a thermally and electrically robust high triplet energy ( E T ) hole‐transport layer (HTL) that can confine triplet excitons within the emission layer (EML) without losing molecular excitons at the interface. Conventionally, HTLs consist of aryl amine derivatives and exhibit low stability toward anion state [2a,3] . One of the major drawbacks of long‐term stability is the substantially low anionic bond dissociation energy (BDE) of the carbon‐nitrogen (C−N) bond.…”

Section: Introductionmentioning

confidence: 99%

Four Dibenzofuran‐Terminated High‐Triplet‐Energy Hole Transporters for High‐Efficiency and Long‐Life Organic Light‐Emitting Devices

Sasabe

Araki

Abe

et al. 2022

Chemistry A European J

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The weak stability of a hole‐transporter upon approaching the anion state is one of the major bottlenecks for developing long‐life organic light‐emitting devices (OLEDs). Therefore, in this study, we developed a series of thermally and electrically stable hole‐transporters that are end‐capped with four dibenzofuran units. These materials exhibit i) high bond dissociation energy (BDE) toward the anion state, ii) a high glass transition temperature (Tg>130 °C), and iii) high triplet energy (ET>2.7 eV), thereby enabling approximately 20 % high external quantum efficiency (EQE) and significantly prolonging the stability of both thermally activated delayed fluorescent (TADF) and phosphorescent OLEDs with an operation lifetime at 50 % (LT50) of 20 000–30 000 h at 1000 cd m−2. In addition, investigating their structure‐property relationship revealed that ionization potential (IP), BDE, and Tg are critical prerequisites for the hole‐transporter to prolong lifetime in OLEDs.

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Stretchable Batteries: Stand‐Alone Intrinsically Stretchable Electronic Device Platform Powered by Stretchable Rechargeable Battery (Adv. Funct. Mater. 50/2020)

Cited by 24 publications

References 0 publications

Improved Efficiency and Lifetime of Deep‐Blue Hyperfluorescent Organic Light‐Emitting Diode using Pt(II) Complex as Phosphorescent Sensitizer

Improved Efficiency and Lifetime of Deep‐Blue Hyperfluorescent Organic Light‐Emitting Diode using Pt(II) Complex as Phosphorescent Sensitizer

Protecting Benzylic CH Bonds by Deuteration Doubles the Operational Lifetime of Deep‐Blue Ir‐Phenylimidazole Dopants in Phosphorescent OLEDs

Four Dibenzofuran‐Terminated High‐Triplet‐Energy Hole Transporters for High‐Efficiency and Long‐Life Organic Light‐Emitting Devices

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