研究目的
Investigating the management of excitons for highly efficient hybrid white organic light-emitting diodes with a non-doped blue emissive layer.
研究成果
The study successfully designed a simple structure for hybrid WOLEDs by introducing a non-doped blue fluorescence emitting layer combined with an orange phosphor as the dopant, achieving high device efficiency. The WOLEDs showed a maximum PE, CE, and EQE of 82.3 lm/W, 70.0 cd/A, and 22.2%, respectively, with good color stability.
研究不足
The study acknowledges the technical constraints related to the optimization of dopant concentrations, the thickness of the non-doped EML, and the selection of host materials, which are critical for determining the performance of the WOLEDs.
1：Experimental Design and Method Selection:
The study employed a simple but efficacious structure for hybrid WOLEDs, including a non-doped blue emissive layer to separate the exciton recombination zone from the light emission region.
2：Sample Selection and Data Sources:
The samples were fabricated using commercially purchased materials without further purification.
3：List of Experimental Equipment and Materials:
Materials included ITO glass substrates, HAT-CN, TAPC, TCTA, 4P-NPD, PO-01, Bepp2, Liq, and Al. Equipment included Spectrascan PR655 photometer and Keithley 2400 source meter.
4：Experimental Procedures and Operational Workflow:
The ITO glass substrates were cleaned and treated with ultraviolet ozone. All layers were thermally evaporated under vacuum. The emissive area of the devices was 3 × 3 mm
5：Data Analysis Methods:
The EL spectra, luminance, and CIE coordinates were measured, and EQEs were calculated from the corresponding current density, luminance, and EL spectra.
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Spectrascan PR655 photometer
PR655
JADAK
Used to measure the EL spectra, luminance, and CIE coordinates of devices.
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Keithley 2400 source meter
2400
Tektronix
Used to measure the current density and voltage characteristics of the devices.
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ITO glass substrates
Used as the anode in the WOLED devices.
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HAT-CN
Used to form a hole-injecting layer (HIL).
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TAPC
Used as the hole-transport layer (HTL).
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TCTA
Used as the hole-transport layer (HTL).
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4P-NPD
Used as the blue emissive layer (EML).
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PO-01
Used as the orange phosphorescent material doped in 4P-NPD to form the orange EML.
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Bepp2
Used as the electron-transport layer (ETL).
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Liq
Used as the electron-injection layer (EIL).
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Al
Used as the cathode.
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