Recent Developments in Tandem White Organic Light-Emitting Diodes

Xiao, Peng; Huang, Junhua; Yu, Yi-Cong; Liu, Baiquan

doi:10.3390/molecules24010151

Cited by 26 publications

(17 citation statements)

References 238 publications

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“…Additionally, the performance of impurity-doped nanocrystal LEDs is projected to be further enhanced if outcoupling technologies can be used, since only approximate 20% light is extracted from the substrate according to the classical ray optical model [ 335 ]. Furthermore, impurity-doped white nanocrystal LEDs may be anticipated by designing emitters with polychromatic emissions or utilizing effective device architectures (e.g., the mixture of blue, green and red impurity-doped nanocrystals in single EML unit, and the combination of various-color nanocrystals in tandem devices [ 336 , 337 , 338 ]), which will further broaden their real applications. Moreover, the development of impurity-doped nanocrystal LEDs is expected to shed light on the other EL applications, such as alternating current thin-film electroluminescent device [ 339 ], and light-emitting field-effect transistors [ 340 ].…”

Section: Discussionmentioning

confidence: 99%

Emergence of Impurity-Doped Nanocrystal Light-Emitting Diodes

Luo

Wang

Qiu³

et al. 2020

Nanomaterials

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In recent years, impurity-doped nanocrystal light-emitting diodes (LEDs) have aroused both academic and industrial interest since they are highly promising to satisfy the increasing demand of display, lighting, and signaling technologies. Compared with undoped counterparts, impurity-doped nanocrystal LEDs have been demonstrated to possess many extraordinary characteristics including enhanced efficiency, increased luminance, reduced voltage, and prolonged stability. In this review, recent state-of-the-art concepts to achieve high-performance impurity-doped nanocrystal LEDs are summarized. Firstly, the fundamental concepts of impurity-doped nanocrystal LEDs are presented. Then, the strategies to enhance the performance of impurity-doped nanocrystal LEDs via both material design and device engineering are introduced. In particular, the emergence of three types of impurity-doped nanocrystal LEDs is comprehensively highlighted, namely impurity-doped colloidal quantum dot LEDs, impurity-doped perovskite LEDs, and impurity-doped colloidal quantum well LEDs. At last, the challenges and the opportunities to further improve the performance of impurity-doped nanocrystal LEDs are described.

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Section: Discussionmentioning

confidence: 99%

Emergence of Impurity-Doped Nanocrystal Light-Emitting Diodes

Luo

Wang

Qiu³

et al. 2020

Nanomaterials

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“…Aside from EQE, CE, power efficiency (PE), luminance, and driving voltage, lifetime is a key parameter to judge whether PeLEDs can be commercialized. In general, T 50 , which represents the time when the luminance decays to its half value, is used to characterize the lifetime of soft-materials based LEDs [108][109][110]. To be more precise, T 95 , T 90 , and T 80 , are also widely utilized in the practical applications.…”

Section: Basic Aspects Of the Lifetime Of Peledsmentioning

confidence: 99%

Advances in Perovskite Light-Emitting Diodes Possessing Improved Lifetime

Xiao

Cheng

et al. 2021

Nanomaterials

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Recently, perovskite light-emitting diodes (PeLEDs) are seeing an increasing academic and industrial interest with a potential for a broad range of technologies including display, lighting, and signaling. The maximum external quantum efficiency of PeLEDs can overtake 20% nowadays, however, the lifetime of PeLEDs is still far from the demand of practical applications. In this review, state-of-the-art concepts to improve the lifetime of PeLEDs are comprehensively summarized from the perspective of the design of perovskite emitting materials, the innovation of device engineering, the manipulation of optical effects, and the introduction of advanced encapsulations. First, the fundamental concepts determining the lifetime of PeLEDs are presented. Then, the strategies to improve the lifetime of both organic-inorganic hybrid and all-inorganic PeLEDs are highlighted. Particularly, the approaches to manage optical effects and encapsulations for the improved lifetime, which are negligibly studied in PeLEDs, are discussed based on the related concepts of organic LEDs and Cd-based quantum-dot LEDs, which is beneficial to insightfully understand the lifetime of PeLEDs. At last, the challenges and opportunities to further enhance the lifetime of PeLEDs are introduced.

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“…We also constructed white light-emitting (WLE) polymeric materials by eliminating the ET through altering the grafted periphery moiety from C343 to pyrene derivatives, whose emission is complementary to that of hb-P1 in the solid state. [51][52][53][54][55] As shown in Scheme S7 (Supporting Information), the pyrene-based, deep-blue emitters 13 and 14 were first synthesized in excellent yields. We then studied the absorption and photoluminescence (PL) spectra of 13, 14, and hb-P1 in their film states ( Figure S36, Supporting Information).…”

Section: White Light-emitting Polymersmentioning

confidence: 99%

Site‐Selective, Multistep Functionalizations of CO₂‐Based Hyperbranched Poly(alkynoate)s toward Functional Polymetric Materials

Song

Zhang

et al. 2020

Advanced Science

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Hyperbranched polymers constructed from CO2 possess unique architectures and properties; however, they are difficult to prepare. In this work, CO2‐based, hyperbranched poly(alkynoate)s (hb‐PAs) with high molecular weights and degrees of branching are facilely prepared under atmospheric pressure in only 3 h. Because hb‐PAs possess two types of ethynyl groups with different reactivities, they can undergo site‐selective, three‐step functionalizations with nearly 100% conversion in each step. Taking advantage of this unique feature, functional hb‐PAs with versatile properties are constructed that could be selectively tailored to contain hydrophilic oligo(ethylene glycol) chains in their branched chains, on their periphery, or both via tandem polymerizations. Hyperbranched polyprodrug amphiphiles with high drug loading content (44.3 wt%) are also generated, along with an artificial light‐harvesting system with high energy transfer efficiency (up to 92%) and white‐light‐emitting polymers. This work not only provides an efficient pathway to convert CO2 into hyperbranched polymers, but also offers an effective platform for site‐selective multistep functionalizations toward functional polymeric materials.

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Recent Developments in Tandem White Organic Light-Emitting Diodes

Cited by 26 publications

References 238 publications

Emergence of Impurity-Doped Nanocrystal Light-Emitting Diodes

Emergence of Impurity-Doped Nanocrystal Light-Emitting Diodes

Advances in Perovskite Light-Emitting Diodes Possessing Improved Lifetime

Site‐Selective, Multistep Functionalizations of CO₂‐Based Hyperbranched Poly(alkynoate)s toward Functional Polymetric Materials

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Recent Developments in Tandem White Organic Light-Emitting Diodes

Cited by 26 publications

References 238 publications

Emergence of Impurity-Doped Nanocrystal Light-Emitting Diodes

Emergence of Impurity-Doped Nanocrystal Light-Emitting Diodes

Advances in Perovskite Light-Emitting Diodes Possessing Improved Lifetime

Site‐Selective, Multistep Functionalizations of CO2‐Based Hyperbranched Poly(alkynoate)s toward Functional Polymetric Materials

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Product

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Site‐Selective, Multistep Functionalizations of CO₂‐Based Hyperbranched Poly(alkynoate)s toward Functional Polymetric Materials