Effect of hole-blocking layer doped with electron-transport molecules on the performance of blue organic light-emitting device

Kim, Yongku; Im, Woo-Bin

doi:10.1002/pssa.200406830

Cited by 28 publications

(22 citation statements)

References 25 publications

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“…For comparison, the photophysical information of 9,10-bis(2,5-dimethyl-4-(naph thalen-2-yl)phenyl)anthracene (BDNA) are summarized in previous literature [4].…”

Section: Methodsmentioning

confidence: 99%

“…Although the BDNPA film showed partial nanocrystals of $30 nm width and 3 nm height and BDNA film showed some pores, both BDNPA and BDNA films had uniform surface morphology with root-mean-square (rms) roughness of 0.36 nm and 0.4 nm for the scan size of 1 lm Â 1 lm. These structural properties are caused by the non-planar molecular structure with steric hindrance which enables pinhole-free surfaces [4].…”

Section: General Physical Propertiesmentioning

confidence: 99%

“…Blue OLEDs have low efficiency, low color purity, and short lifetime compared to green and red OLEDs, and are therefore not well suited to commercial applications. One way to increase the efficiency of blue OLEDs is to increase the efficiency of exciton generation, which is controlled by charge injection and transport or hole blocking [4,5]. As common requirement, development of blue-emitting organic materials with wide intrinsic bandgap will be a great challenge to develop an efficient and thermal stable properties for pure blue-color materials [6].…”

Section: Introductionmentioning

confidence: 99%

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Molecular orientation of a new anthracene derivative for highly-efficient blue fluorescence OLEDs

Sohn

Kim

Jung

et al. 2015

Organic Electronics

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“…For comparison, the photophysical information of 9,10-bis(2,5-dimethyl-4-(naph thalen-2-yl)phenyl)anthracene (BDNA) are summarized in previous literature [4].…”

Section: Methodsmentioning

confidence: 99%

Section: General Physical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Molecular orientation of a new anthracene derivative for highly-efficient blue fluorescence OLEDs

Sohn

Kim

Jung

et al. 2015

Organic Electronics

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“…We believe that the worst device operational lifetime of device II is primarily due to the intrinsic instability of the hole-blocking BCP material. [18] However, the device with c-HTL clearly demonstrates a more than double improvement in EL efficiency, as well as a comparable device operational lifetime to that of the standard device. In summary, carrier recombination as well as the balance of holes and electrons are considered to be some of the most important factors dictating the EQE of OLEDs.…”

mentioning

confidence: 94%

Highly Efficient, Deep‐Blue Doped Organic Light‐Emitting Devices

et al. 2005

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In recent years, there has been considerable interest in developing blue organic light-emitting devices (OLEDs) with high efficiency, deep-blue color, and long operational lifetime. The deep-blue color is defined arbitrarily as having blue electroluminescent (EL) emission with a Commission Internationale de l'Eclairage y coordinate value (CIE y ) of < 0.15. Such emitters can effectively reduce the power consumption of a full-color OLED and can also be utilized to generate light of other colors by energy cascade to a suitable emissive dopant.It is well known that a guest-host doped emitter system can significantly improve device performance in terms of EL efficiency and emissive color, as well as operational lifetime.[1] Although many blue host materials have been reported, such as anthracene, [2] di(styryl)arylene, [3] tetra(phenyl)pyrene, [4] terfluorenes, [5] and tetra(phenyl)silyl derivatives, [6] blue-doped emitter systems having all the attributes of high EL efficiency, long operational lifetime, and deep-blue color, are rare. [7] This is because designing a fluorescent, deep-blue dopant capable of forming an amorphous glassy state upon thermal evaporation with a much shortened p-conjugation length is a rather daunting task. In addition, finding a deep-blue dopant with a small Stokes shift is essential for efficient Förster energy transfer from the host to dopant molecules, since the energy transfer efficiency is highly dependent on the spectral overlap between the emission of the host and the absorption of the dopant.Recently, we have successfully demonstrated an anthracene-based blue host material, 2-methyl-9,10-di(2-naphthyl)-anthracene (MADN), which possesses a wide energy bandgap of 3.0 eV and can also form a stable thin-film morphology upon thermal evaporation. When doped with a di(styryl)-amine-based blue dopant, p-bis(p-N,N-diphenyl-aminostyryl)benzene (DSA-Ph), it achieved a very high EL efficiency of 9.7 cd A -1 , with a greenish-blue color of CIE x,y (0.16, 0.32) and a long operational lifetime of 46 000 h at a normalized initial brightness of 100 cd m -2 .[8] However, the color saturation of the blue-doped emitter system (DSA-Ph@MADN) is far from adequate for application in full-color OLED displays. On the other hand, the symmetrical di(styryl)amine-based organic molecule is well known to possess a high fluorescent quantum yield, [9] and its emission wavelength (k max = 450-480 nm) is dependent on the p-conjugation length, which encompasses the two strongly donating arylamine moieties. However, the molecular engineering of symmetrical di(styryl)amine-based fluorescent dyes to cause hypsochromic shift has its limitations as both donors are already present as part of the styryl p-conjugation.[10]In this paper, we report a series of novel, deep-blue dopants based on unsymmetrical mono(styryl)amine derivatives, which provide us with a basic structure for color tuning within the 430-450 nm spectral region. We show that when doped in the MADN host as an OLED, some of these deep-blue dopants exhibit a...

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“…28,29 COLA, et al 3 Fig. 2) 64 . Para os transportadores de elétrons tem-se os metais quelatos (Alq3, Be e quelatos de Zn) 65 A emissão a partir de um estado tripleto T1 para o S0 é denominado de fosforescência, e tem uma taxa de decaimento lenta (10 -7 -10 -9 s), devido a transição ser à princípio proibida e demandar processos intermediários (cruzamento intersistema) para sua efetivação. A fosforescência pode ser mais acentuada quando em condições de baixa temperatura ou meio rígido, onde o tempo de vida torna-se maior (escala de segundos até minutos).…”

Section: Lumo (Highest Occupied Molecular Orbital E Lowest Unoccupiedunclassified

Investigação teórica da agregação de complexos catiônicos de Ir (III) com potencial aplicação em <i>LEEC\'s</i> e <i>OLED\'s</i>

Almeida¹

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Effect of hole-blocking layer doped with electron-transport molecules on the performance of blue organic light-emitting device

Cited by 28 publications

References 25 publications

Molecular orientation of a new anthracene derivative for highly-efficient blue fluorescence OLEDs

Molecular orientation of a new anthracene derivative for highly-efficient blue fluorescence OLEDs

Highly Efficient, Deep‐Blue Doped Organic Light‐Emitting Devices

Investigação teórica da agregação de complexos catiônicos de Ir (III) com potencial aplicação em <i>LEEC\'s</i> e <i>OLED\'s</i>

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