34.4: 3‐inch, 3000‐ppi Silicon Nitride Masks for Direct Patterning of OLED Microdisplays
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3‐inch, 3000‐ppi silicon nitride masks (SiNMs) have been achieved for the direct patterning of ultrahigh‐resolution RGB side‐by‐side OLED microdisplays.Cite
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Highly efficiency nondoped thermally activated delayed fluorescence (TADF) organic light emitting diodes (OLEDs) with multiquantum wells structure were demonstrated. By using an emitting layer with seven quantum wells, the nondoped TADF OLEDs exhibit high efficiency with EQE of 22.6%, a current efficiency of 69 cd/A, and a power efficiency of 50 lm/W, which are higher than those of the conventional doped OLED and among the best of the TADF OLEDs. The high performance of the devices can be ascribed to effective confinement of the charges and excitons in the emission layer by the quantum well structure. The emission layer with multiquantum well structure is demonstrated to be cost effective for highly efficient nondoped TADF OLEDs and holds great potential for organic electronics.
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Abstract We have fabricated color tunable light sources by combining a transparent and a non‐transparent organic light emitting diodes (OLEDs). This type of color tunable OLED has efficiency losses due to the absorption of a transparent OLED. To minimize the efficiency losses, we have come up with an innovative transparent OLED, which has high transmittance for the light from a non‐transparent OLED and also high bottom to top emission intensity ratio for the light from a transparent OLED. Therefore, the lights from a non‐transparent and a transparent OLEDs could be maximized simultaneously, which resulted in efficient color tunable light sources.
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High-efficiency top-emitting organic light-emitting diodes (OLEDs) with step-doped emission layers are numerically investigated. The simulation results demonstrate that the OLEDs with step-doped emission layers have better electrical performance and higher emitting intensity than those without step-doped design. Compared to conventional OLED devices, step-doped OLEDs with Fabry-Pérot microcavity not only have fixed wavelength but also have narrow emission spectral width. The simulation results suggest that the OLED structure with step-doped design in a Fabry-Pérot microcavity has superior performance and hence is beneficial for the display applications.
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Spark Plasma Sintering
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A blue organic light emitting diode(OLED) with a graded junction(GJ) at hole transporting layer(HTL) and emitted layer(EML) interface was constructed.Compared with the conventional heterojunction(HJ) OLED,GJ OLED exhibited significantly improved stability,and the half lifetime achieved 6998 h at initial luminance 100 cd/m2,which is more than 6 times longer than that of HJ OLED.And a Gaq thin layer is inserted in the TBADN/Alq interface,the step barrier from Alq Gaq to TBADN for electron injection is though formed.The GJ devices with Gaq layer show 20% higher efficiency than that of conventional and 7 times longer lifetime than that of HJ one.
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Translucent Si3N4 ceramics are expected to use for a special optical application in high temperature and corrosive environment owing to its high mechanical strength and thermal and chemical stability. To achieve the translucency of Si3N4 ceramics, fine-grained microstructure with an appropriate sintering aid is important to reduce light scattering. The Si3N4 ceramics were fabricated by spark-plasma sintering (SPS) with AlN – MgO additive. Fine α – Si3N4 powder with high purity was useful to obtain translucent Si3N4 sintered body. When the additive content was large, α – SiAlON formed, whereas β – Si3N4 formed at a small additive content, revealing the high translucency of both phases in visible light region. The AlN/MgO ratio should be on the SiAlON forming line (AlN/MgO = 3/1) in Si3N4 – AlN – MgO phase diagram. The short-time sintering at high temperature (1850 ˚C, 5 min) by SPS was effective to obtain the dense and fine-grained microstructure, and the transmittance of 22～28 % at the wavelength of 900 nm was achieved under the optimal conditions.
Spark Plasma Sintering
Sialon
Thermal Stability
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Nanocomposite organic/inorganic compounds are used to fabricate thick, conductive and highly transparent layers, which are used as hole injection and transport layers in OLEDs. The composite layers consist of SiO2-nanoparticles and the polymer PEDOT:PSS. The filling fraction of PEDOT:PSS in these thick layers is reduced to 3.9%. OLEDs comprising such composite layers show an increased outcoupling efficiency.
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