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Thin film encapsulation for organic light-emitting diodes using inorganic/organic hybrid layers by atomic layer deposition.

Zhang H, Ding H, Wei M, Li C, Wei B, Zhang J - Nanoscale Res Lett (2015)

Bottom Line: A hybrid nanolaminates consisting of Al2O3/ZrO2/alucone (aluminum alkoxides with carbon-containing backbones) grown by atomic layer deposition (ALD) were reported for an encapsulation of organic light-emitting diodes (OLEDs).We found that moisture barrier performance was improved with the increasing of the number of dyads (Al2O3/ZrO2/alucone) and the WVTR reached 8.5 × 10(-5) g/m(2)/day at 25°C, relative humidity (RH) 85%.The half lifetime of a green OLED with the initial luminance of 1,500 cd/m(2) reached 350 h using three pairs of the Al2O3 (15 nm)/ZrO2 (15 nm)/alucone (80 nm) as encapsulation layers.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Yanchang Road 149, Shanghai, 200072 China ; School of Mechatronic Engineering and Automation, Shanghai University, Yanchang Road 149, Shanghai, 200072 China.

ABSTRACT
A hybrid nanolaminates consisting of Al2O3/ZrO2/alucone (aluminum alkoxides with carbon-containing backbones) grown by atomic layer deposition (ALD) were reported for an encapsulation of organic light-emitting diodes (OLEDs). The electrical Ca test in this study was designed to measure the water vapor transmission rate (WVTR) of nanolaminates. We found that moisture barrier performance was improved with the increasing of the number of dyads (Al2O3/ZrO2/alucone) and the WVTR reached 8.5 × 10(-5) g/m(2)/day at 25°C, relative humidity (RH) 85%. The half lifetime of a green OLED with the initial luminance of 1,500 cd/m(2) reached 350 h using three pairs of the Al2O3 (15 nm)/ZrO2 (15 nm)/alucone (80 nm) as encapsulation layers.

No MeSH data available.


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Light transmission characteristics of the encapsulation film.
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Fig4: Light transmission characteristics of the encapsulation film.

Mentions: The used Al2O3, ZrO2, and alucone films are highly transparent. We have measured the light transmission characteristics of the encapsulation film, as shown in Figure 4. The light transmission of the Al2O3 and ZrO2 layer is above 95%. In addition, it is worth to note that the light transmission of both Al2O3/ZrO2/alucone (one pair) and Al2O3/ZrO2/alucone (three pairs) are higher than those of the Al2O3 and ZrO2 layers at the range of 400 to 700 nm. The addition of alucone can effectively prevent the light scattering in visible wavelength (450 to 650 nm) due to the its lower surface RMS. Although the transmission below 450 nm is indeed lower than Al2O3 and Al2O3/ZrO2 films, the transmission increases due to the decreasing light scattering (Additional file 1: Figure S1). This demonstrates that organic/inorganic film may be suitable for the visible electroluminescent emission of the top-emitting OLEDs.Figure 4


Thin film encapsulation for organic light-emitting diodes using inorganic/organic hybrid layers by atomic layer deposition.

Zhang H, Ding H, Wei M, Li C, Wei B, Zhang J - Nanoscale Res Lett (2015)

Light transmission characteristics of the encapsulation film.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4402680&req=5

Fig4: Light transmission characteristics of the encapsulation film.
Mentions: The used Al2O3, ZrO2, and alucone films are highly transparent. We have measured the light transmission characteristics of the encapsulation film, as shown in Figure 4. The light transmission of the Al2O3 and ZrO2 layer is above 95%. In addition, it is worth to note that the light transmission of both Al2O3/ZrO2/alucone (one pair) and Al2O3/ZrO2/alucone (three pairs) are higher than those of the Al2O3 and ZrO2 layers at the range of 400 to 700 nm. The addition of alucone can effectively prevent the light scattering in visible wavelength (450 to 650 nm) due to the its lower surface RMS. Although the transmission below 450 nm is indeed lower than Al2O3 and Al2O3/ZrO2 films, the transmission increases due to the decreasing light scattering (Additional file 1: Figure S1). This demonstrates that organic/inorganic film may be suitable for the visible electroluminescent emission of the top-emitting OLEDs.Figure 4

Bottom Line: A hybrid nanolaminates consisting of Al2O3/ZrO2/alucone (aluminum alkoxides with carbon-containing backbones) grown by atomic layer deposition (ALD) were reported for an encapsulation of organic light-emitting diodes (OLEDs).We found that moisture barrier performance was improved with the increasing of the number of dyads (Al2O3/ZrO2/alucone) and the WVTR reached 8.5 × 10(-5) g/m(2)/day at 25°C, relative humidity (RH) 85%.The half lifetime of a green OLED with the initial luminance of 1,500 cd/m(2) reached 350 h using three pairs of the Al2O3 (15 nm)/ZrO2 (15 nm)/alucone (80 nm) as encapsulation layers.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Yanchang Road 149, Shanghai, 200072 China ; School of Mechatronic Engineering and Automation, Shanghai University, Yanchang Road 149, Shanghai, 200072 China.

ABSTRACT
A hybrid nanolaminates consisting of Al2O3/ZrO2/alucone (aluminum alkoxides with carbon-containing backbones) grown by atomic layer deposition (ALD) were reported for an encapsulation of organic light-emitting diodes (OLEDs). The electrical Ca test in this study was designed to measure the water vapor transmission rate (WVTR) of nanolaminates. We found that moisture barrier performance was improved with the increasing of the number of dyads (Al2O3/ZrO2/alucone) and the WVTR reached 8.5 × 10(-5) g/m(2)/day at 25°C, relative humidity (RH) 85%. The half lifetime of a green OLED with the initial luminance of 1,500 cd/m(2) reached 350 h using three pairs of the Al2O3 (15 nm)/ZrO2 (15 nm)/alucone (80 nm) as encapsulation layers.

No MeSH data available.


Related in: MedlinePlus