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highly efficient white organic light-emitting diodes with ultrathin emissive layers and a spacer-free structure

by:Dolight LED Panel     2019-09-30
Ultra-thin launch layer (UEMLs)
Luminous material with a layer thickness of less than 0.
High introduction of 3 nm
Efficiency Organic light
LEDs (OLEDs).
All UEMLs of white oled can be prepared without using mezzanine or gasket.
And the insertion of the communication direction
Between our spacers, UEMLs.
The free structure not only significantly improves the device efficiency, but also simplifies the production process and has great potential in reducing the cost of OLED panels.
In addition, its interval-
The free structure reduces the number of interfaces that typically introduce unnecessary energy barriers into these devices.
In the current work, UEMLs in red, green and blue-
Luminous materials and yellow and blue light emitting transmitters for display intervals-
Free white oled.
After optimizing the device structure, we demonstrated the gasket-Free simple-
White structure
Oled devices with good device performance.
Our White current and power efficiency-
Up to 56 launch devices. 0u2009cd/A and 55.
5 lm/W, respectively.
These efficiencies are the highest ever made of oled using UEML methods.
Tin oxide (ITO)
In all device studies, coated glass is used as a substrate. Dipyrazino [2,3-f:2′,3′-h]quinoxaline-2,3,6,7,10,11-
Hexacarbonitrile (HAT-CN), 1,1-Bis-(4-methylphenyl)-aminophenyl)-cyclo-hexane (TAPC), N,N,N-tris(4-(9-carbazolyl)phenyl)amine (TCTA), 1,3,5-tri[(3-pyridyl)-phen-3-yl]benzene (TmPyPB), bis(2-methyldibenzo[f,h]-quinoxaline)(Acetone)iridium(III)[Ir(MDQ)(acac)], bis(4-phenylthieno[3, 2-c]pyridine)(Acetone)iridium(III)(PO-01), bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium III (FIrpic), bis(2-phenylpyridine)(Acetone)iridium(III)[Ir(ppy)(acac)]
And lithium (Liq)
Purchase from Xi\'an Polymer Optical Technology Co. , Ltd.
The purity of the material is above 99. 9%.
Prior to the manufacture of the device, the ITO substrate was cleaned by ultrasound in turn with acetone, ethanol and deionized water and dried in an oven at 120 °c for 5 h.
Then, before putting it into the vacuum chamber, treat it with UV ozone for 20 minutes. HAT-
CN is used as a hole
Injection layer (HIL).
TAPC and TCTA are used as holes-
Transmission layer (HTL).
Tmypb and Liq were used as electrons-
Transmission layer (ETL)and electron-
Injection layer (EIL), respectively. Ir(MDQ)(acac), PO-01, Ir(ppy)(acac)
The first is a mix of red, orange, green and blue.
All materials evaporate through a shadow mask at a high vacuum of 2 × 10 ° torr.
Deposition rate of hat
CN, TAPC, TCTA, tmypb, Liq and Al were 0, respectively. 2, 2, 2, 2, 0.
2, 7 m/s/s respectively.
The deposition rate of UEMLs is controlled at 0. 01–0. 02u2009Å/s.
The film thickness is accurately recorded by the Inficon thickness monitor with a rate resolution of 0. 01u2009Å/s.
Glow (EL)
Spectrum, current efficiency (CE)
, CIE coordinates and current density-voltage (J-V)
Measurement properties at a constant current source (
Jishili 2400 s source table)
And the light meter (
Photo study of PR 670 light meter).
All measurements were carried out in ambient air at room temperature, and the external quantum efficiency was calculated assuming the Lamber distribution of the light emission.
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