Highly Efficient Three Primary Color Organic Single‐Crystal Light‐Emitting Devices with Balanced Carrier Injection and Transport

Ding, Ran; Feng, Jing; Dong, Feng‐Xi; Zhou, Wei; Liu, Yang; Zhang, Xu‐Lin; Wang, Xuepeng; Fang, Hong‐Hua; Xu, Bin; Li, Xianbin; Wang, Hai‐Yu; Hotta, Shu

doi:10.1002/adfm.201604659

Cited by 76 publications

(36 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Organic single crystals have attracted ag reat deal of research interest as functional materials,i ncluding the active materials for optoelectronic applications (such as organic light-emitting diodes, [1,2] field-effect transistors [3,4] and optical waveguides [5,6] ), as well as responsive materials for light, [7,8] heat, [9,10] pressure/grinding [11,12] and solvent vapors. [13,14] Recently,o rganic crystals with elasticity,w hich break the traditional thinking that organic crystals are hard and brittle, have been known, and more and more elastic organic single crystals (EOSCs) have been reported.…”

Section: Introductionmentioning

confidence: 99%

An Organic Crystal with High Elasticity at an Ultra‐Low Temperature (77 K) and Shapeability at High Temperatures

Liu

Zhang

et al. 2019

Angew Chem Int Ed

View full text Add to dashboard Cite

Organic single crystals with elastic bending capability and potential applications in flexible devices and sensors have been elucidated. Exploring the temperature compatibility of elasticity is essential for defining application boundaries of elastic materials. However, related studies have rarely been reported for elastic organic crystals. Now, an organic crystal displays elasticity even in liquid nitrogen (77 K). The elasticity can be maintained below ca. 150 °C. At higher temperatures, the heat setting property enables us to make various shapes of crystalline fibers based on this single kind of crystal. Through detailed crystallographic analyses and contrast experiments, the mechanisms behind the unusual low‐temperature elasticity and high‐temperature heat setting are disclosed.

show abstract

Section: Introductionmentioning

confidence: 99%

An Organic Crystal with High Elasticity at an Ultra‐Low Temperature (77 K) and Shapeability at High Temperatures

Liu

Zhang

et al. 2019

Angew Chem Int Ed

View full text Add to dashboard Cite

show abstract

“…It is an effective and simple technique to generate ultrasmooth metallic films on flexible substrate. In the typical process of template stripping ( Figure a), substrates with ultrasmooth surface such as silicon, glass, and mica are used as master templates. Despite the evaporated metal film has a rough surface on the templates, a smooth surface at the interface between metal and template is formed and the smoothness of the opposite surface is close to that of the template.…”

Section: Efficiency Improvement Of Flexible Organic Light‐emitting Dementioning

confidence: 99%

Recent Developments in Flexible Organic Light‐Emitting Devices

Liu

Feng

et al. 2018

Adv Materials Technologies

Self Cite

120

View full text Add to dashboard Cite

wearable displays, and conceptual lighting panels. In addition, besides the excellent designs, a flexible OLED (FOLED) [7, has several other advantages, the displays and lighting panels are thinner, lighter, more cost effective, shatterproof, and durable compared to glass or silicon based OLEDs. They are impact resistance and less prone to break than glass. At present, both flexible displays and lighting panels are being mass produced (Samsung and LG on displays, LG and Konica Minolta on lighting). FOLEDs are becoming most promising and popular next-generation display technology in consumer electronics and lighting panels.In order to develop the FOLEDs and realize their practical application, many great efforts have been conducted. The key components of the FOLEDs are flexible substrate, bottom and top electrode, organic functional layers, encapsulation layer, and optional light extraction layers. Differed from conventional OLEDs on rigid glass or silicon substrate, FOLEDs are fabricated on flexible substrates. Up to now, metal foil, flexible glass, and plastic film have been commonly used as flexible substrates for FOLEDs. On the other hand, actual fabric materials, natural silk fibroin films, bacterial cellulose, and rubbery poly (urethane acrylate) have also been developed to achieve the requirements of wearable and stretchable displays. The electrode is also very important for FOLEDs. Compared with the top electrode, more research has been conducted on the bottom electrode because its surface roughness, conductivity, and transmittance for bottom emitting OLEDs play a key role in the performance of FOLEDs. As conventional indiumtin-oxide (ITO) is not suitable for flexible devices as it is brittle, many great alternatives such as thin metal film, conducting polymer, dielectric-metal-dielectric (DMD) multilayers, metal nanowires, graphene, carbon nanotubes (CNTs), and their compound have been studied. It should be mentioned that the performance of organic layers has almost no difference with rigid OLEDs because of their inherent excellent ductility and identical working mechanism. Moreover, for practical and commercial applications, stability and efficiency are two factors of crucial importance. As a consequence, the encapsulation technique and light extraction of FOLEDs are also two research hotspots in recent years. This review will summarize the key components, discuss the method of implementation, highlight the recent research progresses, and conclude the challenges and prospects of FOLEDs. demand for display technology in consumer electronics and lighting panels increases, thin, light, high-quality, and more cost-effective light-emitting devices are required. Organic light-emitting devices (OLEDs), satisfying the criteria exactly, have been considered the most promising next-generation display and lighting technique. In particular, an OLED based on flexible substrate enables the device to be applied to curved displays, electronic newspapers, wearable displays, and conceptual lighting panels, has been alwa...

show abstract

“…A series of doped crystals are used in the fabrication of organic single‐crystal‐based OLEDs with a multilayered device structure comprising layers of gold (Au), molybdenum trioxide (MoO 3 ), crystal, 2,2′2″‐(1,3,5‐benzinetriyl)‐tris(1‐phenyl‐1‐H‐benzimidazole) (TPBi), calcium (Ca), and silver (Ag) based on the template stripping technique (Figure S7a, Supporting Information) . Both metal electrode films can be thermally evaporated onto the opposite surface of the organic single crystals, ensuring a compact contact between the crystal and electrodes.…”

mentioning

confidence: 99%

“…The Au and Ca are chosen as anode and cathode with work functions of 5.1 and 2.87 eV, respectively, by considering the highest‐occupied molecular orbital (HOMO) and lowest‐unoccupied molecular orbital (LUMO) levels of the BSB‐Me crystal (5.6 and 2.7 eV, respectively) . Energy‐level matching was used to promote charge injection and to balance holes and electrons in the recombination zone (Figure S7b, Supporting Information) . The MoO 3 , a transition metal oxide interface layer with 5.3 eV, was subsequently deposited onto the Au anode as the anodic buffer layer, providing a work function gradient and ensuring hole injection .…”

mentioning

confidence: 99%

“…It is inferred that the higher EQE obtained from 10% doped crystal‐based OLEDs can be ascribed to the higher current efficiency with respect to those of 1% and 3% . The EL performance of the reported organic single crystal‐based OLEDs and LE‐OFETs has been summarized in Table S1 (Supporting Information) for comparison . Undoped BSB‐Me crystals also have been exploited in the fabrication of crystal‐based OLEDs which exhibited bright blue light emission (Figure S8, Supporting Information).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Clarification of the Molecular Doping Mechanism in Organic Single‐Crystalline Semiconductors and their Application in Color‐Tunable Light‐Emitting Devices

et al. 2018

Self Cite

View full text Add to dashboard Cite

Organic single-crystalline semiconductors with long-range periodic order have attracted much attention for potential applications in electronic and optoelectronic devices due to their high carrier mobility, highly thermal stability, and low impurity content. Molecular doping has been proposed as a valuable strategy for improving the performance of organic semiconductors and semiconductor-based devices. However, a fundamental understanding of the inherent doping mechanism is still a key challenge impeding its practical application. In this study, solid evidence for the "perfect" substitutional doping mechanism of the stacking mode between the guest and host molecules in organic single-crystalline semiconductors using polarized photoluminescence spectrum measurements and first-principles calculations is provided. The molecular host-guest doping is further exploited for efficient color-tunable and even white organic single-crystal-based light-emitting devices by controlling the doping concentration. The clarification of the molecular doping mechanism in organic single-crystalline semiconductor host-guest system paves the way for their practical application in high-performance electronic and optoelectronic devices.

show abstract

Highly Efficient Three Primary Color Organic Single‐Crystal Light‐Emitting Devices with Balanced Carrier Injection and Transport

Cited by 76 publications

References 45 publications

An Organic Crystal with High Elasticity at an Ultra‐Low Temperature (77 K) and Shapeability at High Temperatures

An Organic Crystal with High Elasticity at an Ultra‐Low Temperature (77 K) and Shapeability at High Temperatures

Recent Developments in Flexible Organic Light‐Emitting Devices

Clarification of the Molecular Doping Mechanism in Organic Single‐Crystalline Semiconductors and their Application in Color‐Tunable Light‐Emitting Devices

Contact Info

Product

Resources

About