HYBRID ORGANIC-INORGANIC CONDUCTIVE THIN FILM AND ELECTRONIC ELEMENT HAVING THE SAME

Abstract

A hybrid organic-inorganic conductive thin film comprising an organic layer and a plurality of inorganic particles is disclosed, wherein the plurality of inorganic particles comprises a plurality of Cu particles that have an average particle size in a range between 20 nm and 45 nm. This hybrid organic-inorganic conductive thin film is allowed to be used as a hole injection layer (HIL) or a hole transport layer (HTL), so as to be applied in the manufacture of QLED element, OLED element, organic photovoltaic element, hybrid inorganic-organic photovoltaic element, O-FET, O-TFT, or photoreceptor. Moreover, experiment data have proved that, compared to the regular OLED element, the OLED element having the HIL made of the hybrid organic-inorganic conductive thin film has a significant enhancement in device efficiency.

Claims

1. A hybrid organic-inorganic conductive thin film for being applicated in an electronic element, comprising: a polymer layer made of an organic material; and a plurality of inorganic particles, being spread in the polymer layer by a volume percentage concentration in a range between 0.3 Vol % and 10 Vol %; wherein the plurality of inorganic particles comprise a plurality of Cu particles, and the plurality of Cu particles having an average size in a range between 10 nm and 50 nm.

2. The hybrid organic-inorganic conductive thin film of claim 1, wherein the polymer layer has a thickness in a range between 30 nm and 55 nm.

3. The hybrid organic-inorganic conductive thin film of claim 1, wherein the plurality of inorganic particles further comprise a plurality of Cu.sub.2O particles, and the plurality of Cu.sub.2O particles having an average size in a range between 10 nm and 50 nm.

4. The hybrid organic-inorganic conductive thin film of claim 1, wherein the electronic element is selected from a group consisting of QD electroluminescent element, organic electroluminescent element, organic photovoltaic element, hybrid inorganic-organic photovoltaic element, photoreceptor, organic field-effect transistor (O-FET), and organic thin-film transistor (O-TFT).

5. The hybrid organic-inorganic conductive thin film of claim 1, wherein the polymer layer acts as a hole injection layer (HIL), and the organic material is selected from a group consisting of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate), poly(3-Methylthiophene), polypyrrole, polythiophene, and polyaniline.

6. The hybrid organic-inorganic conductive thin film of claim 1, wherein the polymer layer acts as a hole transport layer (HTL), and the organic material is selected from a group consisting of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate), poly(9-vinylcarbazole), poly(N,N-bis(4-butylphenyl)-N,N-bis(phenyl)benzidine), poly[N,N-bis(4-butylphenyl)-N,N-bis(phenyl)-benzidine], tris(4-carbazoyl-9-ylphenyl)amine, di-[4-(N,N-di-p-tolyl-amino)-phenyl]cyclohexane, and poly(9,9-dioctylfluorene-co-N-(4-butylphenyl)diphenylamine)

7. An electronic element acting as an organic electroluminescent device, comprising: an anode layer; a hole injection layer formed on the anode layer, comprising: a polymer layer made of an organic material; and a plurality of inorganic particles, being spread in the polymer layer by a volume percentage concentration in a range between 0.3 Vol % and 10 Vol %; wherein the plurality of inorganic particles comprise a plurality of Cu particles, and the plurality of Cu particles having an average size in a range between 10 nm and nm; an emission layer formed on the hole injection layer; an electronic transport layer formed on the emission layer; an electronic injection layer formed on the electronic transport layer; and a cathode layer.

8. The electronic element of claim 7, wherein the polymer layer has a thickness in a range between 30 nm and 55 nm.

9. The electronic element of claim 7, wherein the plurality of inorganic particles further comprise a plurality of Cu.sub.2O particles, and the plurality of Cu.sub.2O particles having an average size in a range between 10 nm and 50 nm.

10. The electronic element of claim 7, wherein the organic material is selected from a group consisting of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate), poly(3-Methylthiophene), polypyrrole, polythiophene, and polyaniline.

11. The electronic element of claim 7, further comprising a hole transport layer formed between the hole injection layer and the emission layer.

12. The electronic element of claim 7, wherein the emission layer comprises a host portion and at least one dye material doped in the host portion.

13. An electronic element, being selected from a group consisting of QD electroluminescent element, organic electroluminescent element, organic photovoltaic element, hybrid inorganic-organic photovoltaic element, photoreceptor, organic field-effect transistor (O-FET), and organic thin-film transistor (O-TFT); characterized in that wherein the electronic element has a hybrid organic-inorganic conductive thin film, and the hybrid organic-inorganic conductive thin film comprising: a polymer layer made of an organic material; and a plurality of inorganic particles, being spread in the polymer layer by a volume percentage concentration in a range between 0.3 Vol % and 10 Vol %; wherein the plurality of inorganic particles comprise a plurality of Cu particles, and the plurality of Cu particles having an average size in a range between 10 nm and nm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The invention as well as a preferred mode of use and advantages thereof will be best understood by referring to the following detailed description of an illustrative embodiment in conjunction with the accompanying drawings, wherein:

[0036] FIG. 1 shows an absorption spectrum of metal nanoparticles;

[0037] FIG. 2 shows a schematic stereo diagram of a hybrid organic-inorganic conductive thin film according to the present invention;

[0038] FIG. 3 shows a TEM image of a Cu particle spread in a polymer layer;

[0039] FIG. 4 shows an absorption spectrum of Cu particles and Cu.sub.2O particles;

[0040] FIG. 5 shows a first cross-sectional view of an OLED element composing of the hybrid organic-inorganic conductive thin film of the present invention; and

[0041] FIG. 6 shows a second cross-sectional view of the OLED element.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0042] To more clearly describe a hybrid organic-inorganic conductive thin film and an electron element composing a hybrid organic-inorganic conductive thin film, surface inspection system for foil article according to the present invention, embodiments of the present invention will be we will described in detail with reference to the attached graphs drawings hereinafter.

Hybrid Organic-Inorganic Conductive Thin Film

[0043] FIG. 2 shows a schematic stereo diagram of a hybrid organic-inorganic conductive thin film according to the present invention. As FIG. 2 shows, the present invention discloses a hybrid organic-inorganic conductive thin film 1, which is allowed to be used as a hole injection layer (HIL) or a hole transport layer (HTL), so as to be applied in the manufacture of QLED element, OLED element, organic photovoltaic element, inorganic-organic hybrid photovoltaic element, O-FET, O-TFT, or photoreceptor. According to the present invention, the hybrid organic-inorganic conductive thin film 1 principally comprises a polymer layer 11 and a plurality of inorganic particles 12, wherein the plurality of inorganic particles 12 are spread in the polymer layer 11 by a volume percentage concentration in a range between 0.3 Vol % and 10 Vol %. In one embodiment, the polymer layer 11 has a thickness in a range between 30 nm and 55 nm, and the plurality of inorganic particles comprise a plurality of Cu particles, of which the plurality of Cu particles have an average size in a range between 10 nm and 50 nm.

[0044] To describe in detail, in case of the polymer layer 11 acting as a hole injection layer (HIL), the polymer layer 11 is made of PEDOT:PSS (i.e., poly(3,4-ethylene dioxythiophene)-poly(styrenesulfonate)), PMeT (i.e., poly(3-Methylthiophene)), polypyrrole, polythiophene, or polyaniline On the other hand, in case of the polymer layer 11 acting as a hole transport layer (HTL), the polymer layer 22 is made of PEDOT:PSS, PTPD (i.e., poly(N,N-bis(4-butylphenyl)-N,N-bis(phenyl)benzidine)), PVK (i.e., Poly(9-vinylcarbazole), poly-TPD (i.e., poly[N,N-bis(4-butylphenyl)-N,N-bis(phenyl)-benzidine]), TCTA (i.e., tris(4-carbazoyl-9-ylphenyl)amine), or TFB (i.e., poly(9,9-dioctylfluorene-co-N-(4-butylphenyl)diphenylamine)).

[0045] FIG. 3 shows a TEM (Transmission Electron Microscope) image of a Cu particle spread in the polymer layer 11. FIG. 2 and FIG. 3 depict that the hybrid organic-inorganic conductive thin film 1 of the present invention is made by spreading a plurality of Cu particles (i.e., inorganic particles) in a polymer layer 11 made of an organic material like PEDOT:PSS. In the hybrid organic-inorganic conductive thin film 1, the plurality of Cu particles have an average size in a range between 20 nm and 45 nm. Taking FIG. 3 for example, the size of the Cu particle in the TEM image is 31 nm.

[0046] It has been known that, since nano-scale Cu particle has high specific surface energy and high activity, Cu particle is easy to be oxidized so as to become Cu.sub.2O particle. FIG. 4 shows an absorption spectrum graph of Cu particles and Cu.sub.2O particles. In FIG. 4, curve A is an absorption spectrum measured from Cu.sub.2O particles, and curve B is an absorption spectrum measured from Cu.sub.2O+Cu particles. According to curve A, it is observed that the intensity of the absorption spectrum of Cu.sub.2O particles approaches 0 at wavelength around 700 nm. On the other hand, curve B shows that the intensity of the absorption spectrum of Cu.sub.2O+Cu particles approaches 0 at wavelength around 1000 nm. Therefore, experimental data of FIG. 4 have revealed that, by making the inorganic particles 12 spread in the polymer layer 11 simultaneously include Cu.sub.2O particles and Cu particles, the inorganic particles12 certainly have an wide absorption band ranging from 300 nm to 1000nm. According to the present invention, the Cu.sub.2O particles have an average size in a range between 10 nm and 50 nm.

Experimental Data

[0047] For proving that the electronic element 1 using hybrid organic-inorganic conductive thin film 1 as a HIL or a HTL thereof indeed has an improved device performance, experiments are designed and then completed. In the experiments, multiple OLED elements are manufactured, such that the power efficacy (PE), the current efficacy (CE) and the external quantum efficiency (EQE) of each of the OLED elements are measured.

[0048] FIG. 5 shows a first cross-sectional view of an OLED element having the hybrid organic-inorganic conductive thin film of the present invention. Engineers skilled in development and manufacture of organic electroluminescent elements certainly know that, an OLED element 2 principally comprises: an anode layer 21, a hole injection layer (HIL), an emission layer (EML) 23, an electron transport layer (ETL) 24, an electron injection layer (EIL) 25, and a cathode layer 26. In the OLED element 2 shown in FIG. 5, the emission layer 23 comprises a host portion and at least one dye material doped in the host portion. Moreover, the hybrid organic-inorganic conductive thin film 1 comprising a polymer layer 11 and a plurality of inorganic particles 12 are used as the hole injection layer of the OLED element 2. Detail descriptions of each of the multiple function layers of the OLED element 2 are summarized in following tables (1)-(3).

TABLE-US-00001 TABLE 1 Blue OLED element Function layer Material Thickness (nm) anode layer ITO 125 polymer layer PEDOT:PSS 40 of HIL host layer TCTA 30 of EML blue dye Flrpic ETL TPBi 35 EIL LiF 1 cathode layer Al 100

TABLE-US-00002 TABLE 2 Green OLED element Function layer Material Thickness (nm) anode layer ITO 125 polymer layer PEDOT:PSS 40 of HIL host layer TCTA 30 of EML green dye Ir(ppy).sub.3 ETL TPBi 35 EIL LiF 1 cathode layer Al 100

TABLE-US-00003 TABLE 3 Red OLED element Function layer Material Thickness (nm) anode layer ITO 125 polymer layer PEDOT:PSS 40 of HIL host layer TCTA 30 of EML red dye Ir(2-phq).sub.3 ETL TPBi 35 EIL LiF 1 cathode layer Al 100

[0049] There is a need to further explain that, in each of the blue OLED element, the green OLED element and the red OLED element, a plurality of inorganic particles 12 are spread in the polymer layer 11 by a volume percentage concentration of 0.5 Vol %. Furthermore, related measurement data are integrated in following tables (4)-(5). In table (4), remark W/O means that the OLED element includes regular HIL. On the contrary, remark W means that the OLED element uses the hybrid organic-inorganic conductive thin film 1 of the present invention as the HIL thereof. Therefore, the measurement data of tables (4)-(5) have revealed that, compared to the OLED element 2 including regular HIL, the OLED element having the HIL made of the hybrid organic-inorganic conductive thin film 1 has a significant enhancement in device efficiency.

TABLE-US-00004 TABLE 4 PEmax (%) CEmax (%) EQEmax (%) W/O W W/O W W/O W blue OLED 13 14 16 20 6.9 8.3 element green OLED 52 60 50 57 14 16 element red OLED 25 31 24 30 11 13 element

TABLE-US-00005 TABLE 5 PE increment CE increment EQE increment (%) (%) (%) blue OLED 6 23 20 element green OLED 15 15 16 element red OLED 23 23 23 element

[0050] FIG. 6 shows a second cross-sectional view of an OLED element composing of the hybrid organic-inorganic conductive thin film of the present invention. Engineers skilled in development and manufacture of organic electroluminescent elements also know that, an OLED element 2 can also be designed to comprises: an anode layer 21, a hole transport layer (HTL) 22, a hole injection layer (HIL), an emission layer (EML) 23, an electron transport layer (ETL) 24, an electron injection layer (EIL) 25, and a cathode layer 26. In the OLED element 2 shown in FIG. 6, the emission layer 23 comprises a host portion and at least one dye material doped in the host portion. Moreover, the hybrid organic-inorganic conductive thin film 1 comprising a polymer layer 11 and a plurality of inorganic particles 12 are used as the HIL of the OLED element 2. Detail descriptions of each of the multiple function layers of the OLED element 2 are summarized in following tables (6)-(7).

TABLE-US-00006 TABLE 6 Deep-blue OLED element Function layer Material Thickness (nm) anode layer ITO 125 polymer layer PEDOT:PSS 40 of HIL HTL poly(vinylcarbazole) 30 (PVK) host layer TCTA 30 of EML deep-blue dye 27CN3PI ETL TPBi 35 EIL LiF 1 cathode layer Al 100

TABLE-US-00007 TABLE 7 Deep-red OLED element Function layer Material Thickness (nm) anode layer ITO 125 polymer layer PEDOT:PSS 40 of HIL HTL mCP 15 host layer TCTA 30 of EML deep-red dye cf3pzpy ETL TPBi 35 EIL LiF 1 cathode layer Al 100

[0051] There is a need to further explain that, in each of the deep-blue OLED element and the deep-red OLED element, a plurality of inorganic particles 12 are spread in the polymer layer 11 by a volume percentage concentration of 0.5 Vol %. Furthermore, related measurement data are integrated in following tables (8)-(9). In table (8), remark W/O means that the OLED element includes regular HIL. On the contrary, remark W means that the OLED element uses the hybrid organic-inorganic conductive thin film 1 of the present invention as the HIL thereof. Therefore, the measurement data of tables (8)-(9) have revealed that, compared to the OLED element including regular HIL, the OLED element having the HIL made of the hybrid organic-inorganic conductive thin film 1 has a significant enhancement in device efficiency.

TABLE-US-00008 TABLE 8 PEmax (%) CEmax (%) EQEmax %) W/O W W/O W W/O W deep-blue 0.4 0.9 0.9 2.0 1.9 2.4 OLED element deep-red 5.1 6.2 8.2 9.9 11 14 OLED element

TABLE-US-00009 TABLE 9 PE increment CE increment EQE increment (%) (%) (%) deep-blue 125 122 26 OLED element deep-red 22 21 24 OLED element

[0052] As a result, experimental data have proved that, the hybrid organic-inorganic conductive thin film 1 of the present invention can indeed be used a HIL or a HTL, so as to be applied in the manufacture of QLED element, OLED element, organic photovoltaic element, hybrid inorganic-organic photovoltaic element, O-FET, O-TFT, or photoreceptor. Moreover, experiment data have also proved that, compared to the regular OLED element, the OLED element having the HIL made of the hybrid organic-inorganic conductive thin film 1 has a significant enhancement in device efficiency.

[0053] Therefore, through above descriptions, all embodiments and their constituting elements of the hybrid organic-inorganic conductive thin film according to the present invention have been introduced completely and clearly. Moreover, the above description is made on embodiments of the present invention. However, the embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or alterations within the spirit of the present invention still fall within the scope of the present invention.