CN102683613A - Top emission organic electroluminescent display (OELD) and preparation method thereof - Google Patents
Top emission organic electroluminescent display (OELD) and preparation method thereof Download PDFInfo
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- CN102683613A CN102683613A CN2012101315071A CN201210131507A CN102683613A CN 102683613 A CN102683613 A CN 102683613A CN 2012101315071 A CN2012101315071 A CN 2012101315071A CN 201210131507 A CN201210131507 A CN 201210131507A CN 102683613 A CN102683613 A CN 102683613A
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Abstract
The invention provides a top emission organic electroluminescent display (OELD) with improved light output. The top emission (OELD) comprises a substrate, a cathode, an electronic transmission layer, a luminous layer, a hole transport layer and an anode, wherein a certain number of spherical crown-shaped bulges which have a certain size and are tightly arranged are formed on the surface of the substrate, and the spherical crown-shaped bulges have the chord length L of 2 to 5 mu m and the height H of 1 to 3 mu m. By the structure, the light extraction efficiency of the device can be improved, so that the quality of the device is improved.
Description
Technical field
The invention belongs to flat panel display, illumination technical field of organic electroluminescence, be specifically related to a kind of top radiation organic EL display and preparation method thereof with the output of improvement light.
Background technology
The advantages such as driving voltage characteristic that organic elctroluminescent device (OLED) has wide visual angle, excellent contrast, quick response, high brightness, excellence can realize flexible the demonstration.But OLED still is unrealized universally up to now, and the life-span of device, cost, efficient etc. have all become the bottleneck of OLED development, and light emission rate is one of the problem that influences the most critical of device efficiency.Therefore, the light emission rate that how to improve device is current hot issue.The method that is usually used in improving the device light emission rate at present mainly comprises lenticule, substrate alligatoring, adopts network etc., and the realization technology of these methods and the degree that improves light emission rate have nothing in common with each other, but have all improved the light extraction efficiency of device to a certain extent.No matter but which kind of method also should be further considered the influence to display quality.
Summary of the invention
The object of the present invention is to provide a kind of top radiation organic EL display with the output of improvement light and preparation method thereof, this display of organic electroluminescence has improved light emission rate.
For realizing above-mentioned purpose, the present invention has adopted following technical scheme:
A kind of top radiation organic EL display; Comprise the substrate, negative electrode, electron transfer layer, luminescent layer, hole transmission layer and the anode that set gradually from bottom to top; Be distributed with the convexity of spherical crown shape or approximate spherical crown shape on the said substrate on the side surface relative with negative electrode, the convexity that distributes on the shape of negative electrode, electron transfer layer, luminescent layer, hole transmission layer and anode and the substrate adapts.
The chord length of said convexity is 2-5 μ m, highly is 1-3 μ m.
Said convexity is closely arranged.
A kind of method for preparing above-mentioned top radiation organic EL display may further comprise the steps:
1) method of employing polishing or chemical corrosion prepares the convexity of spherical crown shape or approximate spherical crown shape on a side surface of glass, obtains substrate;
2) with putting into vacuum coating equipment after the substrate cleaning; Vapor deposition or sputter cathode, vapor deposition or sputter electron transfer layer on negative electrode on a side surface that is distributed with convexity on the substrate; Vapor deposition or sputter luminescent layer on electron transfer layer; Vapor deposition or sputter hole transmission layer on luminescent layer, vapor deposition or sputter anode on hole transmission layer;
3) in the environment of anhydrous and oxygen-free, encapsulate after having prepared anode, obtain the top radiation organic EL display.
Top radiation organic EL display according to the invention is protruding through preparation spherical crown shape on substrate, has reduced light and at anode and organic layer interface the ratio of total reflection has taken place, so improved the light extraction efficiency of organic elctroluminescent device significantly.
Description of drawings
Fig. 1 is the cross section structure sketch map of top radiation organic EL display according to the invention;
Fig. 2 is the schematic cross-section of substrate according to the invention;
Fig. 3 is one of schematic diagram of top radiation organic EL display according to the invention;
Fig. 4 be top radiation organic EL display according to the invention schematic diagram two;
Among the figure: 1, substrate; 2, negative electrode; 3, electron transfer layer; 4, luminescent layer; 5, hole transmission layer; 6, anode.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.Need to prove that following embodiment only is used to explain the present invention, be not limited to practical range of the present invention.
Referring to Fig. 1 and Fig. 2; Top radiation organic EL display according to the invention; Comprise the substrate 1, negative electrode 2, electron transfer layer 3, luminescent layer 4, hole transmission layer 5 and the anode 6 that set gradually from bottom to top, be distributed with the convexity of spherical crown shape or approximate spherical crown shape on the said substrate 1 on the side surface relative with negative electrode 2, negative electrode 2, electron transfer layer 3, luminescent layer 4, hole transmission layer 5 and anode 6 be shaped as wavy shaped configuration; And the convexity that distributes on said wavy shaped configuration and the substrate 1 adapts; The chord length of said convexity is 2-5 μ m, highly is 1-3 μ m, and said convexity is closely arranged.
A kind of method for preparing above-mentioned top radiation organic EL display may further comprise the steps: 1) method of employing polishing or chemical corrosion prepares the convexity of spherical crown shape or approximate spherical crown shape on a side surface of glass, obtains substrate 1; 2) with putting into vacuum coating equipment after substrate 1 cleaning; Vapor deposition or sputter cathode 2, vapor deposition or sputter electron transfer layer 3 on negative electrode 2 on a side surface that is distributed with convexity on the substrate; Vapor deposition or sputter luminescent layer 4 on electron transfer layer 3; Vapor deposition or sputter hole transmission layer 5 on luminescent layer 4, vapor deposition or sputter anode 6 on hole transmission layer 5; 3) prepare anode 6 backs and in the environment of anhydrous and oxygen-free, encapsulated, obtained the top radiation organic EL display.
Referring to Fig. 3 and Fig. 4, θ
cBeing light at anode and organic layer interface (ab among Fig. 3) critical angle of total reflection takes place, and perpendicular to the tangent line of crossing the circular arc that a point and b order, the length of oa and ob is r respectively for oa and ob, and ab is exactly the chord length L of spherical crown shape convexity, L=2rsin θ
c, depth H=r (1-cos θ that the spherical crown shape is protruding
c), the light that along continuous straight runs incident a is ordered, when incidence angle less than critical angle, reflect and is got in the anode, spherical crown shape projection interface reflection that the part incident ray is close to or refraction and, improved light extraction efficiency from anode front outgoing.Confirming of the chord length and the degree of depth is the continuity of considering the system film with device in the requirement of organic layer integral thickness, confirm action about 1 μ m, the relation of definite thus chord length and arc radius.
The present invention has the following advantages:
(1) with negative electrode, organic material vapor deposition on raised surface, the contact area S of planar structure
1=π L
2/ 4=π R
2Sin θ
c, the contact area S of spherical crown
2=2 π RH=2 π R
2(1-cos θ
c), contact area increases, and injected electrons quantity increases, thereby improves the luminous efficiency of device;
(2) in the prior art, when light during from the anode outgoing, owing to have total reflection, so efficient is lower, the present invention provides a kind of bulge-structure, makes the ray reduced scale of incidence angle greater than critical angle, therefore makes total reflection reduce, and improves the efficient of device.
Because there are above-mentioned 2 advantages in the present invention,, can make the light emission rate of device improve 25% through parameter control.
Claims (4)
1. top radiation organic EL display; Comprise the substrate (1), negative electrode (2), electron transfer layer (3), luminescent layer (4), hole transmission layer (5) and the anode (6) that set gradually from bottom to top; It is characterized in that: said substrate (1) is gone up the convexity that is distributed with spherical crown shape or approximate spherical crown shape on the side surface relative with negative electrode (2), and the shape of negative electrode (2), electron transfer layer (3), luminescent layer (4), hole transmission layer (5) and anode (6) and substrate (1) are gone up the convexity that distributes and adapted.
2. according to the said a kind of top radiation organic EL display of claim 1, it is characterized in that: the chord length of said convexity is 2-5 μ m, highly is 1-3 μ m.
3. according to the said a kind of top radiation organic EL display of claim 1, it is characterized in that: said convexity is closely arranged.
4. one kind prepares the method for top radiation organic EL display according to claim 1, it is characterized in that: may further comprise the steps:
1) method of employing polishing or chemical corrosion prepares the convexity of spherical crown shape or approximate spherical crown shape on a side surface of glass, obtains substrate (1);
2) with putting into vacuum coating equipment after substrate (1) cleaning; Be distributed with vapor deposition or sputter cathode (2) on the protruding side surface on the substrate, going up vapor deposition or sputter electron transfer layer (3) at negative electrode (2); (3) vapor deposition or sputter luminescent layer (4) on electron transfer layer; Go up vapor deposition or sputter hole transmission layer (5) at luminescent layer (4), go up vapor deposition or sputter anode (6) at hole transmission layer (5);
3) prepare anode (6) back and in the environment of anhydrous and oxygen-free, encapsulated, obtained the top radiation organic EL display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101315071A CN102683613A (en) | 2012-05-02 | 2012-05-02 | Top emission organic electroluminescent display (OELD) and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101315071A CN102683613A (en) | 2012-05-02 | 2012-05-02 | Top emission organic electroluminescent display (OELD) and preparation method thereof |
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| CN102683613A true CN102683613A (en) | 2012-09-19 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931360A (en) * | 2012-10-25 | 2013-02-13 | 四川虹视显示技术有限公司 | Organic light emitting diode |
| CN103413896A (en) * | 2013-07-18 | 2013-11-27 | 陕西科技大学 | Two-side light exiting OLED device and manufacturing method thereof |
| CN104183749A (en) * | 2013-05-22 | 2014-12-03 | 海洋王照明科技股份有限公司 | Inversed organic light emission diode, display screen and terminal |
| CN107293647A (en) * | 2017-06-13 | 2017-10-24 | 苏州大学 | A kind of light emitting diode with quantum dots and preparation method thereof |
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| US20050104075A1 (en) * | 2003-04-16 | 2005-05-19 | Evans Allan K. | Feedback and coupling structures and methods |
| JP2005174717A (en) * | 2003-12-10 | 2005-06-30 | Samsung Yokohama Research Institute Co Ltd | Organic el element and its manufacturing method |
| TW200533229A (en) * | 2004-02-19 | 2005-10-01 | Heptagon Oy | Organic light emitting device |
| KR100773992B1 (en) * | 2006-11-21 | 2007-11-08 | (주)케이디티 | Oled and the manufacturing method of that |
| CN101201490A (en) * | 2007-12-04 | 2008-06-18 | 友达光电股份有限公司 | Method for thinning display panel device |
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2012
- 2012-05-02 CN CN2012101315071A patent/CN102683613A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| US20050104075A1 (en) * | 2003-04-16 | 2005-05-19 | Evans Allan K. | Feedback and coupling structures and methods |
| JP2005174717A (en) * | 2003-12-10 | 2005-06-30 | Samsung Yokohama Research Institute Co Ltd | Organic el element and its manufacturing method |
| TW200533229A (en) * | 2004-02-19 | 2005-10-01 | Heptagon Oy | Organic light emitting device |
| KR100773992B1 (en) * | 2006-11-21 | 2007-11-08 | (주)케이디티 | Oled and the manufacturing method of that |
| CN101201490A (en) * | 2007-12-04 | 2008-06-18 | 友达光电股份有限公司 | Method for thinning display panel device |
Non-Patent Citations (1)
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| WON HOE KOO等人: "Light extraction from organic light-emitting diodes enhanced by spontaneously formed buckles", 《NATURE PHOTONICS》, vol. 4, 21 February 2012 (2012-02-21) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931360A (en) * | 2012-10-25 | 2013-02-13 | 四川虹视显示技术有限公司 | Organic light emitting diode |
| CN104183749A (en) * | 2013-05-22 | 2014-12-03 | 海洋王照明科技股份有限公司 | Inversed organic light emission diode, display screen and terminal |
| CN103413896A (en) * | 2013-07-18 | 2013-11-27 | 陕西科技大学 | Two-side light exiting OLED device and manufacturing method thereof |
| CN103413896B (en) * | 2013-07-18 | 2016-04-06 | 陕西科技大学 | OLED of a kind of two-sided bright dipping and preparation method thereof |
| CN107293647A (en) * | 2017-06-13 | 2017-10-24 | 苏州大学 | A kind of light emitting diode with quantum dots and preparation method thereof |
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Application publication date: 20120919 |