White organic electroluminescent devices

Tsou, Chuan-Cheng; Lu, Huei-Tzong; Yokoyama, M.

doi:10.1016/j.jcrysgro.2005.12.112

Cited by 5 publications

(5 citation statements)

References 8 publications

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“…5b). Similar photoluminescence maximum shift was observed for DCM molecules in various dielectrics constant solvents 14,15 (see Fig. 6d).…”

Section: Absorption and Light Emission Propertiessupporting

confidence: 82%

“…c) Photoluminescence maximum wavelength of DCM compound in various dielectric constant solvents. 14,15 Lines are guideline for eyes These values are larger compared to experimentally measured optical dielectric constant of 2.22 for PMMA. 18 It means that dielectric constant of the system was increased by increasing the amount of the active molecules.…”

Section: Absorption and Light Emission Propertiesmentioning

confidence: 68%

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Amplified spontaneous emission of glass forming DCM derivatives in PMMA films

2014

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4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM) is well known red laser dye which can be used also in solid state organic lasers. The lowest threshold value of amplified spontaneous emission was achieved by doping 2wt% of DCM molecule in tris-(8-hydroxy quinoline) aluminium (Alq 3 ) matrix. Further increase of dye concentration also increases threshold value. It is due to large intermolecular interaction which reduce photoluminescence quantum yield. Compounds with small intermolecular interaction and which exhibit similar amplified spontaneous properties as DCM could be useful for solid state organic lasers.In the work photoluminescence and amplified spontaneous emission properties of two DCM derivatives in poly(methyl methacrylate) (PMMA) matrix were investigated. Bulky trityloxyethyl groups are attached to the donor part of investigated molecules. These groups reduce intermolecular distance wherewith reduce photoluminescence quenching. More than one order of magnitude lower excitation threshold energy of the amplified spontaneous emission was achieved in doped polymer films with investigated compound in comparison to doped polymer with DCM. It means that the investigated compound is more perspective as a laser material compared to previously study.

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“…5b). Similar photoluminescence maximum shift was observed for DCM molecules in various dielectrics constant solvents 14,15 (see Fig. 6d).…”

Section: Absorption and Light Emission Propertiessupporting

confidence: 82%

Section: Absorption and Light Emission Propertiesmentioning

confidence: 68%

Amplified spontaneous emission of glass forming DCM derivatives in PMMA films

2014

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“…All measurements were carried out at room temperature under ambient conditions. energy transfer can happen from NPB to Alq 3 or from Alq 3 to DCJTB [5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Methodsmentioning

confidence: 99%

Energy distribution in white organic light-emitting diodes with three primary color emitting layers

Lou

Shen

et al. 2010

Sci. China Phys. Mech. Astron.

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Two types of organic light-emitting diodes with structures of ITO/N,N′-bis(1-naphthyl)-N,N′-diphenyl,1,1′-biphenyl-4,4′-diamine (NPB)/tris(8-hydroquinolinato)aluminum(Alq 3 )/2,9-dimethyl-4,7-diphenyl-l,10-phenanthroline(BCP)/Alq 3 :4-dicyanomethylene-2-(tert-butyl)-6-methyl-4H-pyran(DCJTB)/Alq 3 /Al and ITO/NPB/BCP/Alq 3 /Alq 3 :DCJTB/Alq 3 /Al were studied. NPB was chosen as a hole-transporting/blue-emitting layer. Alq 3 adjacent to BCP acted as a green emitting layer while that adjacent to the Al cathode acted as an electron-transporting layer. Alq 3 doped with 2 wt.% DCJTB was used as a red emitting layer. The operating principles of the devices were explained by the mechanism of Förster energy transfer and the hole and exciton blocking effect of BCP. It was found that the spectral characteristics of the devices strongly depended on the relative location between the green emitting Alq 3 layer and the BCP layer, as well as their thickness. Pure white emission with the CIE coordinates of (0.33, 0.33) was achieved by mixing the three primary colors in the device with the structure of ITO/NPB(30 nm)/ BCP(6 nm)/Alq 3 (30 nm)/Alq 3 :DCJTB(30 nm)/Alq 3 (30 nm)/Al. The BCP layer played an important role in distributing the exciton energy among the three emitting layers to achieve a balanced white light. The white emission of this device was largely insensitive to the driving voltage (15-27 V) with the insertion of the green emitting Alq 3 layer.white organic light-emitting diodes, three primary color emitting layers, exciton energy distribution PACS: 73.61.Ph, 78.60.Fi

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“…The key advantages of organic light-emitting diodes (OLEDs) for flat panel display applications are their self emitting property, high luminous efficiency, full colour capability, wide viewing angle, high contrast, low power consumption, low weight and potentially large, which are a colour displays and flexibility [1][2][3][4][5][6][7][8][9][10]. In 1987,Tang et al reported a stacked EL cell structure, which has a luminescent efficiency of 1.5 lm/W and a luminance of 1000 cd/m 2 for green light under lower operating voltage than 10V [1].…”

Section: Introductionmentioning

confidence: 99%

Efficient Organe Organic Light-Emitting Devices Using N-arylbenzinmidzoles as Blocking Layer

Yang

2013

AMR

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A orange organic light-emitting device has been fabricated with a structure of ITO/m-MTDATA (45 nm)/NPB (8 nm)/ DPVBi:DCJTB 0.5 % (15 nm)/TPBi (x nm)/Alq3[(60-x) n /LiF (1 nm)/Al£¬where x=0, 4, 7 and 10, respectively. N-arylbenzinmidzoles (TPBi) was used as the excton-blocking layer resulting mixture of lights from DPVBi molecules (blue-light) and DCJTB (yellow-light) molecules, thereby producing orange light emission. The performance of device can be readily adjusted by only varying the thickness of the TPBi layer. The Commission Internationale de 1'Eclairage (CIE) coordinates of the device are largely insensitive to diffrent of the driving voltages. When the thickness of TPBi is 7 nm, the device exhibits peak efficiency of 6.16 cd/A at the applied voltage of 8 V, and the maximum brightness is 43310 cd/m2at 15 V, respectively.

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White organic electroluminescent devices

Cited by 5 publications

References 8 publications

Amplified spontaneous emission of glass forming DCM derivatives in PMMA films

Amplified spontaneous emission of glass forming DCM derivatives in PMMA films

Energy distribution in white organic light-emitting diodes with three primary color emitting layers

Efficient Organe Organic Light-Emitting Devices Using N-arylbenzinmidzoles as Blocking Layer

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