CN111200002B - Flexible controllable organic electroluminescent array, preparation method and application - Google Patents

Flexible controllable organic electroluminescent array, preparation method and application Download PDF

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CN111200002B
CN111200002B CN202010027764.5A CN202010027764A CN111200002B CN 111200002 B CN111200002 B CN 111200002B CN 202010027764 A CN202010027764 A CN 202010027764A CN 111200002 B CN111200002 B CN 111200002B
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net
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alq
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CN111200002A (en
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江诚鸣
曹旭光
卜镜元
宋金会
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Dalian University of Technology
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    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
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    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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Abstract

The invention belongs to the technical field of flexible display, and relates to a flexible controllable organic electroluminescent array, a preparation method and application thereof. The organic electroluminescent device of the present inventionThe luminescent array consists of five layers of nano nets, namely a PVA nano fiber net, an Ag nano net and Alq in sequence from bottom to top3Nano-mesh, NPB nano-mesh and ITO nano-mesh. When the LED is applied TO pattern controllable light emitting, the stripe arrays of the Ag nano net and the TO nano net are respectively used as a cathode and an anode and are connected with a control system, and different cathode and anode switches are controlled by the control system TO emit light in specific point rows according TO the requirements of light emitting patterns. Because only the array in the specific area is lighted and operated, other arrays are in an off state, and therefore, the power consumption of the lighted array is lower during operation. Because the luminous array is processed on the flexible nano fiber net, the luminous array has the function of flexibility and provides reference for the flexible wearable luminous device in the future.

Description

Flexible controllable organic electroluminescent array, preparation method and application
Technical Field
The invention belongs to the technical field of flexible display, and relates to a flexible controllable organic electroluminescent array, a preparation method and application thereof.
Background
Compared with a conventional Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED) has become a mainstream in the Display field due to its characteristics of low power consumption, high saturation, fast response, wide viewing angle, wide color gamut, thin thickness, flexibility, and the like.
At present, a mature electrostatic spinning technology is used for preparing a transparent flexible organic electroluminescent array. The electrostatic spinning technology is a method for preparing a nanofiber material by utilizing the breakdown effect of a high-voltage electrostatic field on a high-molecular solution, and finally forming nanofibers on a receiving device. However, the conventional organic electroluminescent displays emit light in a large area, and thus, it is impossible to control light emission in a specific area or to form a specific pattern by using an active array of crossing electrodes.
Disclosure of Invention
In view of the defects and shortcomings of the prior art, the invention provides a flexible and controllable organic electroluminescent array, a preparation method and application thereof, and the prepared organic electroluminescent array can achieve different light-emitting effects by controlling the array in a specific area.
The technical scheme of the invention is as follows:
a flexible controllable organic electroluminescent array comprises five layers of nano nets, namely a PVA nano fiber net, an Ag nano net and tris (8-hydroxyquinoline) aluminum (Alq) in sequence from bottom to top3) A nanomesh, an amine derivative (NPB) nanomesh, and an Indium Tin Oxide (ITO) nanomesh; wherein, the PVA nano fiber net is used as a substrate, and the rest is a luminous array layer; the Ag nano-net is a stripe array and is positioned on the surface of the PVA nano-fiber net, and the Alq is3The nano net is a circular array and is positioned on the surface of the Ag nano net, and the size and the shape of the NPB nano net and the Alq3The nano-net is the same and is positioned at Alq3On the surface of the nanoweb; the ITO nano net is a stripe array, is positioned on the surface of the NPB nano net, has the same size and shape as the Ag nano net, the stripes of the ITO nano net and the Ag nano net are mutually vertical, the Ag nano net and the NPB nano net are not contacted with each other, and the intersection points of the stripe arrays of the ITO nano net and the Ag nano net are the NPB nano net and the Alq3A circular array of nanonets.
A preparation method of a flexible controllable organic electroluminescent array comprises the following specific steps:
the first step is as follows: manufacturing a PVA nano-fiber net substrate by utilizing an electrostatic spinning technology; wherein the spinning solution is a PVA solution with the concentration of 10-15%;
the second step is that: covering the surface of the PVA nano-fiber net substrate prepared in the first step by using a first mask plate in a vacuum environment, and forming a film on the PVA nano-fiber net substrate
Figure BDA0002363087760000021
Thermally evaporating Ag at the evaporation rate of (3) to form a stripe array Ag nano-net;
the size of the first mask is larger than or equal to that of the PVA nanofiber net substrate, rectangular openings with the same size are formed in the first mask at equal intervals, and a grid shape is formed; the width of the rectangular openings is 40-120 mu m, and the width of the part without the openings between the adjacent rectangular openings is the same as the width of the rectangular openings;
the third step: under the vacuum condition, a third mask is placed on the surface of the Ag nano-net prepared in the second step and placed on the Ag nano-net
Figure BDA0002363087760000023
Evaporation rate of (3) thermal evaporation of Alq3Forming a circular array of Alq3A nanomesh;
the size of the third mask is larger than or equal to that of the PVA nanofiber web substrate, round holes with the same size are symmetrically arranged on the third mask at equal intervals to form a round hole array, the diameter of each round hole is 40-120 mu m, the interval between the round holes in each row is the same as the diameter of each round hole, and the diameter of each round hole is the same as the width of the rectangular opening of the first mask;
the fourth step: placing a third mask plate in the Alq prepared in the third step under the vacuum condition3On the surface of the nanoweb at Alq3On the nano-net
Figure BDA0002363087760000022
The evaporation rate of the third mask is completely consistent with that of the third step, so that the NPB nano net and the Alq nano net are subjected to thermal evaporation coating of the NPB3The nano nets are completely overlapped to form the NPB nano net with a circular array;
the fifth step: under the vacuum condition, a second mask is placed on the surface of the NPB nano net prepared in the fourth step, ITO is magnetically sputtered on the NPB nano net in the circular array, the direction of rectangular opening of the second mask is perpendicular to the direction of opening of the first mask in the second step, the second mask completely covers the Ag nano net, the ITO nano net in the stripe array is formed, and the stripe array cross points of the ITO nano net and the Ag nano net are the NPB nano net and the Alq nano net3A circular array of nanonets;
wherein, the size of second mask version is more than or equal to PVA nanofiber web substrate size, and equidistant the opening of second mask version has the rectangle trompil with the size, forms the grid form, and the size of rectangle trompil is the same with first mask version, and the position of the rectangle trompil of the two is complete complementary.
When the Ag nano-net is applied to a pattern controllable light-emitting device, the stripe array of the Ag nano-net is used as a cathode of an electroluminescent array; alq3The circular array of the nano net is used as an organic light emitting layer of an electroluminescent array for transmitting injected electrons and emitting light in electron hole recombination, the circular array of the NPB nano net is used as a hole transmission layer of the electroluminescent array for injecting holes, and Alq3The nano net and the NPB nano net together form a light-emitting unit; the striped array of the ITO nano-net is used as an anode of the electroluminescent array; the stripe array of the Ag nano net and the stripe array of the ITO nano net are connected with a control system, and different cathode and anode switches are controlled by the control system to emit light in specific point columns according to the requirements of light-emitting patterns.
The invention has the beneficial effects that:
the invention overcomes the defect that the light emission of the traditional OLED to a specific area is uncontrollable, controls the on-off of the cathodes and the anodes of different rows and columns through the control system, and can change the light-emitting pattern of the light-emitting array at any time by a user. Because only the array in the specific area is lighted and operated, other arrays are in an off state, and therefore, the power consumption of the lighted array is lower during operation. Because the luminescent array is processed on the flexible nano fiber net, the invention also realizes the function of flexibility, and provides reference for the flexible wearable luminescent device in the future.
Drawings
Fig. 1 is a schematic diagram of an application of a flexible controllable organic electroluminescent array prepared according to a first embodiment of the present invention;
fig. 2 is a schematic control diagram of a flexible controllable organic electroluminescent array prepared according to a first embodiment of the present invention in a specific application;
FIG. 3 is a side view of a flexible controllable organic electroluminescent array according to the present invention;
FIG. 4 is a schematic view of a PVA nanoweb substrate of the invention;
FIG. 5 is a schematic view of a first reticle of the present invention;
FIG. 6 is a schematic view of a second reticle of the present invention;
FIG. 7 is a schematic view of a third mask of the present invention;
in the figure: 1, electrostatic spinning receiving disc; 2PVA nanofiber web; 3Ag nano net; 4Alq3A nanomesh; 5NPB nanomesh; 6ITO nano net; 7 light emitting array layer.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
FIG. 3 is a schematic diagram of a flexible controllable organic electroluminescent array structure of the present invention, which comprises five layers of nano-mesh, from bottom to top in sequence, PVA nano-fiber mesh 2, Ag nano-mesh 3, and Alq3The nano-film 4, the NPB nano-net 5 and the ITO nano-net 6 are received on the electrostatic spinning receiving disc 1 in the preparation process.
FIG. 1 is a schematic diagram of an application of a flexible controllable organic electroluminescent array according to the present invention, in which a luminescent array layer 7 (including Ag nano-mesh 3, Alq)3The nano-film 4, the NPB nano-net 5 and the ITO nano-net 6) are arranged on the electrostatic spinning receiving disc 1, and the light-emitting array layer 1 is connected with a control system.
Fig. 4 is a schematic view of a PVA nanoweb substrate with a PVA nanoweb 2 dropped onto an electrospinning receiving pan 1.
Example one
Manufacturing a PVA (polyvinyl alcohol) nano-fiber net as a substrate by utilizing an electrostatic spinning technology; wherein the spinning solution is PVA solution with the concentration of 10 percent, the diameter of a liquid spraying pinhole is 0.7mm, the liquid flow is 10ml/min, and the direct current voltage of 15kV is adopted.
Under the vacuum environment, a first mask is adopted to cover the surface of the PVA nano-fiber net, and the PVA nano-fiber net substrate is covered with the first mask
Figure BDA0002363087760000051
Thermally evaporating Ag at the evaporation rate of (3) to form a stripe array Ag nano-net; the first reticle is constructed as shown in FIG. 5, wherein the rectangular openings are 40 μm wide.
Placing a third mask on the surface of the Ag nano-net under vacuum condition, and placing the third mask on the Ag nano-net
Figure BDA0002363087760000052
Evaporation rate of (3) thermal evaporation of Alq3Forming a circular array of Alq3A nanomesh; the third mask is shown in fig. 7, in which the diameter of the circular openings is 40 μm, and the distance between the circular holes in each row and each column is 40 μm.
Placing the third mask plate in Alq under vacuum condition3On the surface of the nanoweb at Alq3On the nano-net
Figure BDA0002363087760000053
The evaporation rate of the third mask is completely consistent with that of the third step, so that the NPB nano net and the Alq nano net are subjected to thermal evaporation coating of the NPB3The nano nets are completely overlapped to form the NPB nano net with a circular array;
and under the vacuum condition, placing the second mask on the surface of the NPB nano net, and carrying out magnetron sputtering on the ITO on the NPB nano net with the circular array at the power of 50W, wherein the rotating speed is 20 revolutions per minute, and the sputtering time is 600 seconds. The direction of the rectangular opening of the second mask plate is mutually vertical to the opening direction of the first mask plate for thermally evaporating the Ag nano net, and the second mask plate completely covers the Ag nano net to form the ITO nano net with a stripe array, and the stripe array cross points of the ITO nano net and the Ag nano net are the NPB nano net and the Alq nano net3A circular array of nanonets; the second mask has a structure as shown in fig. 6, wherein the rectangular openings of the second mask have a width of 40 μm, and the positions of the rectangular openings are completely complementary.
The flexible controllable organic electroluminescence array prepared by the embodiment is connected with a control system and used as a pattern controllable light-emitting device, a stripe array of an Ag nano-net is used as a cathode of the electroluminescence array, a stripe array of an ITO nano-net is used as an anode of the electroluminescence array, the stripe array of the Ag nano-net and the stripe array of the ITO nano-net are both connected with the control system, different cathode and anode switches are controlled by the control system to emit light at specific point arrays according to the requirements of light-emitting patterns, a dotted line in the figure is an unpowered array or array, a solid line is an electrified array or array, and light-emitting units at the intersection of the electrified array and the array emit light at the same time.
Example two
The preparation method and the steps are the same as the first embodiment, except that the spinning solution is PVA high molecular solution with the concentration of 12 percent; the widths of the rectangular openings of the first mask plate and the second mask plate are 80 micrometers, the diameter of the circular opening of the third mask plate is 80 micrometers, and the distance between the circular holes in each row is 80 micrometers; the evaporation rate of thermal evaporation is as follows
Figure BDA0002363087760000061
EXAMPLE III
The preparation method and the steps are the same as the first embodiment, except that the spinning solution is PVA high molecular solution with the concentration of 15 percent; the widths of the rectangular openings of the first mask plate and the second mask plate are 120 micrometers, the diameter of the circular opening of the third mask plate is 120 micrometers, and the distance between the circular holes in each row is 120 micrometers; the evaporation rate of thermal evaporation is as follows
Figure BDA0002363087760000062
The flexible controllable organic electroluminescent array prepared by the embodiment is connected with a control system, and the control system controls the on-off of the luminescent array circuit by a signal of '0' or '1', as shown in fig. 2. The broken line in the figure indicates that the control system gives the opening of the circuit, i.e. the signal "0"; the solid line represents the communication of the control system to the circuit, i.e., signal "1"; the row-column intersection of the solid lines is the active light-emitting cell.

Claims (3)

1. The flexible controllable organic electroluminescent array is characterized by consisting of five layers of nano nets, wherein the five layers of nano nets are sequentially a PVA nano fiber net, an Ag nano net and Alq from bottom to top3A nano-mesh, an NPB nano-mesh and an ITO nano-mesh; wherein, the PVA nano fiber net is used as a substrate, and the rest is a luminous array layer; the Ag nano-net is a stripe array and is positioned on the surface of the PVA nano-fiber net, and the Alq is3The nano net is a circular array and is positioned on the surface of the Ag nano net, and the size and the shape of the NPB nano net and the Alq3The nano-net is the same and is positioned at Alq3On the surface of the nanoweb; the ITO nano net is a stripe array, is positioned on the surface of the NPB nano net, has the same size and shape as the Ag nano net, the stripes of the ITO nano net and the Ag nano net are mutually vertical, the Ag nano net and the NPB nano net are not contacted with each other, and the intersection points of the stripe arrays of the ITO nano net and the Ag nano net are the NPB nano net and the Alq3A circular array of nanonets.
2. The method for preparing the flexible controllable organic electroluminescent array according to claim 1, comprising the following steps:
the first step is as follows: manufacturing a PVA nano-fiber net substrate by utilizing an electrostatic spinning technology; wherein the spinning solution is a PVA solution with the concentration of 10-15%;
the second step is that: covering the surface of the PVA nano fiber net substrate prepared in the first step by using a first mask in a vacuum environment, and thermally evaporating Ag on the PVA nano fiber net substrate at an evaporation rate of 0.1-0.3A/s to form a stripe array Ag nano net;
the size of the first mask is larger than or equal to that of the PVA nanofiber net substrate, rectangular openings with the same size are formed in the first mask at equal intervals, and a grid shape is formed; the width of the rectangular openings is 40-120 mu m, and the width of the part without the openings between the adjacent rectangular openings is the same as the width of the rectangular openings;
the third step: under the vacuum condition, a third mask is placed on the surface of the Ag nano-net prepared in the second step, and Alq is thermally evaporated on the Ag nano-net at the evaporation rate of 0.1-0.3A/s3Forming a circular array of Alq3A nanomesh;
the size of the third mask is larger than or equal to that of the PVA nanofiber web substrate, round holes with the same size are symmetrically arranged on the third mask at equal intervals to form a round hole array, the diameter of each round hole is 40-120 mu m, the interval between the round holes in each row is the same as the diameter of each round hole, and the diameter of each round hole is the same as the width of the rectangular opening of the first mask;
the fourth step: placing a third mask plate in the Alq prepared in the third step under the vacuum condition3On the surface of the nanoweb at Alq3Thermally evaporating NPB on the nano-net at the evaporation rate of 0.1-0.3A/s, wherein the placement position of the third mask is completely consistent with that in the third step, so that the NPB nano-net and Alq are enabled to be3The nano nets are completely overlapped to form the NPB nano net with a circular array;
the fifth step: under the vacuum condition, a second mask is placed on the surface of the NPB nano net prepared in the fourth step, ITO is magnetically sputtered on the NPB nano net in the circular array, the direction of rectangular opening of the second mask is perpendicular to the direction of opening of the first mask in the second step, the second mask completely covers the Ag nano net, the ITO nano net in the stripe array is formed, and the stripe array cross points of the ITO nano net and the Ag nano net are the NPB nano net and the Alq nano net3A circular array of nanonets;
wherein, the size of second mask version is more than or equal to PVA nanofiber web substrate size, and equidistant the opening of second mask version has the rectangle trompil with the size, forms the grid form, and the size of rectangle trompil is the same with first mask version, and the position of the rectangle trompil of the two is complete complementary.
3. The use of a flexible controllable organic electroluminescent array according to claim 1 in a light emitting device, wherein the striped array of Ag nanomesh serves as the cathode of the electroluminescent array; alq3The circular array of the nano net is used as an organic light emitting layer of an electroluminescent array for transmitting injected electrons and emitting light in electron hole recombination, the circular array of the NPB nano net is used as a hole transmission layer of the electroluminescent array for injecting holes, and Alq3The nano net and the NPB nano net together form a light-emitting unit; the striped array of the ITO nano-net is used as an anode of the electroluminescent array; the stripe array of the Ag nano net and the stripe array of the ITO nano net are connected with a control system, and different cathode and anode switches are controlled by the control system to enable the specific point columns to emit light according to the requirements of light-emitting patterns.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002249765A (en) * 2000-09-25 2002-09-06 Konica Corp Organic electroluminescence element, material for organic electroluminescence element and display device
CN103053221A (en) * 2011-02-22 2013-04-17 松下电器产业株式会社 Organic el device
CN104505149A (en) * 2014-11-19 2015-04-08 东北师范大学 Laminated transparent electrode and preparation method thereof
KR20170012070A (en) * 2015-07-23 2017-02-02 주식회사 아모그린텍 Fiberous-web structure type diffusion sheet, Manufacturing method thereof and Back light unit containing the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002249765A (en) * 2000-09-25 2002-09-06 Konica Corp Organic electroluminescence element, material for organic electroluminescence element and display device
CN103053221A (en) * 2011-02-22 2013-04-17 松下电器产业株式会社 Organic el device
CN104505149A (en) * 2014-11-19 2015-04-08 东北师范大学 Laminated transparent electrode and preparation method thereof
KR20170012070A (en) * 2015-07-23 2017-02-02 주식회사 아모그린텍 Fiberous-web structure type diffusion sheet, Manufacturing method thereof and Back light unit containing the same

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