Highly efficient near ultraviolet organic light-emitting diode based on a meta-linked donor–acceptor molecule

Liu, Haichao; Bai, Qing; Yao, Liang; Zhang, Haiyan; Xu, Hai; Zhang, Shitong; Li, Weijun; Gao, Yu; Li, Jinyu; Lü, Ping; Wang, Hongyan; Yang, Bing; Ma, Yan

doi:10.1039/c5sc01131k

Cited by 258 publications

(128 citation statements)

References 71 publications

(27 reference statements)

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“…These limit their appealing deployment for low‐cost and large‐scale applications. In light of this, looking for low‐cost and solution‐processed materials has become increasingly important and is one of the main directions for deep‐blue‐LED studies in the past 20 years …”

Section: Introductionmentioning

confidence: 99%

2D Ruddlesden–Popper Perovskite Nanoplate Based Deep‐Blue Light‐Emitting Diodes for Light Communication

Deng

Jin

et al. 2019

Adv Funct Materials

113

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Ruddlesden-Popper perovskite, (PEA) 2 PbBr 4 (PEA = C 8 H 9 NH 3 ), is a steady and inexpensive material with a broad bandgap and a narrow-band emission. These features make it a potential candidate for deep-blue light-emitting diodes (LEDs). However, due to the weak exciton binding energy, LEDs based on the perovskite thin films usually possess a very low external quantum efficiency (EQE) of <0.03%. Here, for the first time, the construction of high-performance deep-blue LEDs based on 2D (PEA) 2 PbBr 4 nanoplates (NPs) is demonstrated. The as-fabricated (PEA) 2 PbBr 4 NPs film shows a deep-blue emission at 410 nm with excellent stability under ambient conditions. Impressively, LEDs based on the (PEA) 2 PbBr 4 NPs film deliver a bright deep-blue emission with a maximum luminance of 147.6 cd m −2 and a high EQE up to 0.31%, which represents the most efficient and brightest perovskite LEDs operating at deep-blue wavelengths. Furthermore, the LEDs retain over 80% of their efficiencies for over 1350 min under ≈60% relative humidity. The steady and bright deep-blue LEDs can be used as an excitation light source to realize white light emission, which shows the potential for light communication. The work provides scope for developing perovskite into efficient and deep-blue LEDs for low-cost light source and light communication.

show abstract

Section: Introductionmentioning

confidence: 99%

2D Ruddlesden–Popper Perovskite Nanoplate Based Deep‐Blue Light‐Emitting Diodes for Light Communication

Deng

Jin

et al. 2019

Adv Funct Materials

113

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“…Current efficiency (CE) and power efficiency (PE) were calculated from the plot of J-V-L. The EQE is calculated by using the formula [29] 780 380 780…”

Section: Device Characterizationmentioning

confidence: 99%

High-efficiency/CRI/color stability warm white organic light-emitting diodes by incorporating ultrathin phosphorescence layers in a blue fluorescence layer

et al. 2017

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By incorporating ultrathin (<0.1 nm) green, yellow, and red phosphorescence layers with different sequence arrangements in a blue fluorescence layer, four unique and simplified fluorescence/phosphorescence (F/P) hybrid, white organic light-emitting diodes (WOLEDs) were obtained. All four devices realize good warm white light emission, with high color rending index (CRI) of >80, low correlated color temperature of <3600 K, and high color stability at a wide voltage range of 5 V-9 V. These hybrid WOLEDs also reveal high forward-viewing external quantum efficiencies (EQE) of 17.82%-19.34%, which are close to the theoretical value of 20%, indicating an almost complete exciton harvesting. In addition, the electroluminescence spectra of the hybrid WOLEDs can be easily improved by only changing the incorporating sequence of the ultrathin phosphorescence layers without device efficiency loss. For example, the hybrid WOLED with an incorporation sequence of ultrathin red/yellow/ green phosphorescence layers exhibits an ultra-high CRI of 96 and a high EQE of 19.34%. To the best of our knowledge, this is the first WOLED with good tradeoff among device efficiency, CRI, and color stability. The introduction of ultrathin (<0.1 nm) phosphorescence layers can also greatly reduce the consumption of phosphorescent emitters as well as simplify device structures and fabrication process, thus leading to low cost. Such a finding is very meaningful for the potential commercialization of hybrid WOLEDs.

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“…Thus, the TNa‐PI based doped OLEDs can retain good performances. Furthermore, the OLED employing 30 wt.% TNa‐PI as EML can emit highly efficient near UV light, showing an ultralow CIE y of ≈0.04 with a decent EQE of 2.52% at a practical luminance of 1000 cd m −2 , representing one of the smallest efficiency roll‐offs among the reported OLEDs with similar color emissions …”

Section: Resultsmentioning

confidence: 96%

Polyphenylnaphthalene as a Novel Building Block for High‐Performance Deep‐Blue Organic Light‐Emitting Devices

Chen

Yuan

Zhu

et al. 2017

Advanced Optical Materials

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A new member of polycyclic aromatic hydrocarbons named 1,2,3,4‐tetraphenylnaphthalene (TNa) is exploited and used as a potential building block in deep‐blue organic light‐emitting devices (OLEDs) for the first time. By incorporating TNa with phenanthroimidazole, three blue emitters named TNa‐PI, TNa‐BPI, and TNa‐DPI featuring different length of phenyl linkers are designed and synthesized via a facile approach, and systematically characterized with thermal, morphological, theoretical, photophysical, electrical, and electroluminescent (EL) studies. The new fluorophores show intramolecular charge transfer properties in excited state evidenced by positive solvatochromic effect in emission. Theoretical calculation suggests that TNa serves as an electron acceptor in the new molecules. All the new materials can emit intense deep‐blue fluorescence in thin film and show bipolar carrier transport properties, with electron conductivity much better than that of hole. Nondoped OLEDs based on TNa‐DPI exhibit excellent EL performance with a maximum external quantum efficiency (EQE) of 5.78% and deep‐blue emission with color purity of (0.152, 0.085). Furthermore, in the 30 wt.% doped device, TNa‐PI emits efficient violet‐blue EL with Commission Internationale de l'Èclarage coordinates of (0.156, 0.043) and shows a decent EQE of 2.52% at a practical brightness of 1000 cd m−2.

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Highly efficient near ultraviolet organic light-emitting diode based on a meta-linked donor–acceptor molecule

Abstract: A meta-linked donor–acceptor (D–A) structure was utilized to achieve high-efficiency and colour-purity near ultraviolet (NUV) in organic light-emitting diodes (OLEDs).

Cited by 258 publications

References 71 publications

2D Ruddlesden–Popper Perovskite Nanoplate Based Deep‐Blue Light‐Emitting Diodes for Light Communication

2D Ruddlesden–Popper Perovskite Nanoplate Based Deep‐Blue Light‐Emitting Diodes for Light Communication

High-efficiency/CRI/color stability warm white organic light-emitting diodes by incorporating ultrathin phosphorescence layers in a blue fluorescence layer

Polyphenylnaphthalene as a Novel Building Block for High‐Performance Deep‐Blue Organic Light‐Emitting Devices

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