Organic EL materials based on styryl and amine derivatives

Sakai, Toshio; Hosokawa, Chishio; Fukuoka, K.; Tokailin, H.; Hironaka, Yoshio; Ikeda, H.; Funahashi, Masakazu; Kusumoto, Tetsuo

doi:10.1889/1.1827857

Cited by 6 publications

(10 citation statements)

References 10 publications

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“…Figure shows the evolution of lifetime compared at the same initial luminance of 1000 cd/m 2 . ,,,,,,,,− In case of missing data of the initial luminance, we used the simple extrapolation of the available data with eq and n = 1, even though it can lead to an overestimation of the lifetime data. Because of the fact that this extrapolation is only necessary for data mainly collected in the last century, this overestimation may be a tribute to the pioneering work of our colleagues.…”

Section: Introductionmentioning

confidence: 99%

Degradation Mechanisms and Reactions in Organic Light-Emitting Devices

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Degradation Mechanisms and Reactions in Organic Light-Emitting Devices

et al. 2015

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“…For fabricating efficient blue OLED devices with good chromaticity, we need to conduct further studies. [11][12][13] Tang et al 14) of Kodak found that a doped emitter can greatly increase electroluminescence (EL) efficiency, shift colors, and endure the operational stability of organic EL devices. Usually a host was doped with one kind of dopant, for example, tris-(8-hydroxy-quinoline)aluminum (Alq 3 ) doped with a Coumarin545 (C545) emitter for green and 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM) for red.…”

Section: Introductionmentioning

confidence: 99%

Efficiency and Color Coordinate Improvement Using Codopants in Blue Organic Light-Emitting Diode

Wang

Chen

You

et al. 2005

Jpn. J. Appl. Phys.

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The codoping method is applied to fabricate efficient blue organic light-emitting diodes (OLEDs). With the same structure of indium–tin oxide (ITO)/N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'diamine (NPB)(80 nm)/light-emitting layer (30 nm)/tris-(8-hydroxy-quinoline)aluminum (Alq3) (20 nm)/LiF (1 nm)/Al (120 nm), a set of three devices was manufactured for comparison. For Devices 1, 2, and 3, the light-emitting layers are 9,10-di(2-naphthyl)anthracene (ADN):4,4'-(1,4-phenylenedi-2,1-ethene diyl)bis[N,N-bis(4-methylphenyl)-benzenamine] (DPAVB) (1 wt %), ADN:2,5,8,11-tetra-(t-butyl)-perylene (TBPE) (1 wt %), and ADN:DPAVB (0.3 wt %):TBPE (0.7 wt %), respectively. It is found that the codoped Device 3 has the highest maximum luminance, Electroluminescence (EL) quantum efficiency and color saturation. Further study on the effect of the codopants was through a relative photoluminescence (PL) quantum efficiency measurement. The result shows that the relative PL efficiencies of Devices 1, 2, and 3 are 15.6, 19.3, and 24%, respectively, as determined using an integrating sphere system excited at 375 nm. The codoping method improves the EL efficiency intrinsically. Codopants of the heterogeneous light-emitting molecules may decrease the possibility of self-quenching from the interaction of the homogenous molecules at the same total doping concentration. Furthermore, the decrease in the interaction of homogenous molecules suppresses the light emission from the aggregations thus narrowing the emission spectrum, and results in saturated blue light emission.

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“…For effective blue OLEDs, host materials such as distyrylarylene derivatives and styrylamine are commonly used. With suitable dopant materials, devices show high efficiency, brightness and good color saturation [3][4][5]. However, lifetime issue is still one of the major concerns in such a device [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

<title>Blue organic light-emitting device with low driving voltage and high current efficiency</title>

2005

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In this paper, we report a high efficiency organic light-emitting device (OLED) with a high electron mobility electron transport layer (ETL) material and high efficiency blue dopant material. Typically, the mobility of a hole transport layer (HTL) material is much higher than that of an electron transport layer (ETL) material. Here we used the bis(10hydroxyben-zo[h]quinolinato)beryllium (Bebq2) as the ETL material that exhibits superior electron mobility. It effectively reduced the driving voltage and increased the power efficiency. The blue dopant material was 4,4'-bis[2-(4-(N,N-diphenylamino)phenyl)vinyl]biphenyl (DPAVBi) in the 9,10-bis(2'-naphthyl) anthracene (BNA), that was the host material of the emitting layer (EML). At 100 cd/m 2 , the current efficiencies with different dopant concentration can be as high as 19.2 cd/A with the CIE coordinate at (0.154, 0.238). Driving voltage at 20mA/cm 2 was 4.94 V of this device. With increasing the doping concentration, the drive voltage variation did not vary much and was within 0.6 V at 20 mA/cm 2 . The emitting mechanism in such a device may be mainly due to energy transfer rather than carrier trapping. CIE coordinate of such a device shifted toward blue with increasing current density due to intense light emission from the host material of the EML. The highest efficiency was achieved when doping concentration is 3%.

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Organic EL materials based on styryl and amine derivatives

Abstract: Abstract— Excellent organic electroluminescent materials are needed in order to obtain color EL devices with high performance. We have succeeded in realizing bright and efficient devices with long lifetime in various color regions, based on styryl and amine derivatives.

Cited by 6 publications

References 10 publications

Degradation Mechanisms and Reactions in Organic Light-Emitting Devices

Degradation Mechanisms and Reactions in Organic Light-Emitting Devices

Efficiency and Color Coordinate Improvement Using Codopants in Blue Organic Light-Emitting Diode

<title>Blue organic light-emitting device with low driving voltage and high current efficiency</title>

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