CN108807700B - Transparent display film - Google Patents

Transparent display film Download PDF

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CN108807700B
CN108807700B CN201710284068.0A CN201710284068A CN108807700B CN 108807700 B CN108807700 B CN 108807700B CN 201710284068 A CN201710284068 A CN 201710284068A CN 108807700 B CN108807700 B CN 108807700B
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light
layer
substituted
transparent display
electron
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CN108807700A (en
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李硕
蒋雷
刁建高
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Zhangjiagang Kangdexin Optronics Material Co Ltd
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Zhangjiagang Kangdexin Optronics Material Co Ltd
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Abstract

The invention provides a transparent display film. The transparent display film comprises a substrate layer and a luminous layer which are sequentially laminated, wherein a luminous material with an electron-withdrawing group is arranged in the luminous layer, and the luminous material emits visible light under the irradiation of exciting light of an exciter. The luminescent layer comprises the luminescent material after the electron-withdrawing group is introduced, so that the excitation spectrum of the luminescent material is subjected to blue shift by introducing the electron-withdrawing group, the transparent display film can self-emit light under the irradiation of ultraviolet light or visible light, the ground color of the transparent display film is reduced, and the attractiveness of the transparent display film is ensured.

Description

Transparent display film
Technical Field
The invention relates to the technical field of optics, in particular to a transparent display film.
Background
With the development of display technology, display products are changing day by day, and the main competitive products in the market at present are liquid crystal, plasma, LED and projection, and places mainly used for projection, such as meeting rooms, home theaters, exhibitions, exhibition halls, scientific and technological shows and tourist attractions. Flat panel displays such as liquid crystal displays are mainly used for mobile traffic and advertisement displays.
However, the flat panel display not only occupies space, but also brings great potential safety hazard when the flat panel display is mounted on a seat and a rear windshield in a vehicle, so that the problem that the flat panel display cannot be mounted exists.
Moreover, at present, more and more markets, office buildings and automobiles use high-light-transmission architectural glass, the traditional display can influence the light transmission of the glass, and if the transparent display can be introduced without influencing the light transmission performance, the glass is inevitably favored by users.
The transparent display technologies in the current market mainly include: holographic displays, TOLED, reflective displays, blue reflective plates, and transparent LCDs. However, the above-mentioned film gives a background color to the film due to the excitation of the luminescent material in a broad band, and the presence of the background color affects the beauty of the film, thereby limiting the further application of the transparent display film.
Moreover, the transparent display devices all have a problem of low transmittance, so that the luminous efficiency of the display devices is limited, and the display devices are difficult to be widely applied, for example, a liquid crystal display manufactured by eliminating backlight has only 15% transmittance, the organic light emitting diode transmittance can be 30-40%, the hologram screen transmittance is only 15%, the reflective HUD transmittance is only 50-60%, and the application is limited due to high price.
Disclosure of Invention
The invention mainly aims to provide a transparent display film to solve the problem of ground color of the transparent display film in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a transparent display film comprising a substrate layer and a light-emitting layer sequentially laminated, wherein a light-emitting material having an electron-withdrawing group is provided in the light-emitting layer, and the light-emitting material emits visible light under irradiation of excitation light of an exciter.
Further, the electron-withdrawing group is selected from one or more of naphthyl substituent, anthryl substituent, heterocyclic compound and phenyl substituent, and the benzene ring of the phenyl substituent is connected with-COOH, -OH and-NO2、-CHO、-OH、-OCH3、-NHCOCH3、-C6H5Any one or more of.
Further, the above luminescent material emits blue light under the irradiation of the excitation light of the exciter, the luminescent material is selected from any one or more of a compound a, a compound B and a compound C, the compound a is a material in which the structural formula shown in formula I is substituted by an electron-withdrawing group, the compound B is a material in which the structural formula shown in formula II is substituted by an electron-withdrawing group, and the compound C is a material in which the structural formula shown in formula III is substituted by an electron-withdrawing group:
Figure BDA0001280259520000021
wherein Ar is1～Ar12Independently selected from H, C6～C30Substituted or unsubstituted aromatic hydrocarbon radical, C6～C30Substituted or unsubstituted fused ring aromatic hydrocarbon group of (A), C6～C30Substituted or unsubstituted fused heterocyclic group, five-membered, six-membered heterocyclic ring or substituted heterocyclic ring, triarylamine group, aryl ether group, C1～C12And Ar is any one of a substituted or unsubstituted aliphatic alkyl group of (a), and1～Ar8not simultaneously being H or Ar13Is selected from C6～C30Substituted or unsubstituted aromatic hydrocarbon radical, C6～C30Substituted or unsubstituted fused ring aromatic hydrocarbon group of (A), C1～C12Preferably Ar is substituted with an electron-withdrawing group of formula I1And Ar5At least one of them, preferably Ar is substituted with an electron withdrawing group as described in formula II4And Ar8At least one of them, preferably Ar is substituted with an electron withdrawing group as described in formula III13。
Further, the above luminescent material emits red light under the irradiation of the excitation light of the exciter, the luminescent material is selected from any one or more of a compound E, a compound F and a compound G, the compound E is a material formed by the structural formula shown in formula IV being substituted by the electron-withdrawing group, the compound F is a material formed by the structural formula shown in formula V being substituted by the electron-withdrawing group, and the compound G is a material formed by the structural formula shown in formula VI being substituted by the electron-withdrawing group:
Figure BDA0001280259520000022
Figure BDA0001280259520000031
wherein Ar is14And Ar15Independently selected from H, C6～C20Aromatic group of (2), C4～C20And C4～C20Any one of the condensed ring aromatic groups of (A), Ar14And Ar15Not simultaneously being a hydrogen atom or a 4- (2, 2-diphenylvinyl) -substituted phenyl group, R7～R10Independently selected from H, C1～C30Alkyl and C6～C20N is an integer of 1 to 4, preferably Ar is substituted by the electron-withdrawing group shown in the formula IV, the formula V or the formula VI14And Ar15At least one of (a).
Further, the above luminescent material emits green light under the irradiation of the excitation light of the exciter, and the luminescent material is selected from the group consisting of a host material of the luminescent material emitting green light having the electron-withdrawing group described above and including
Figure BDA0001280259520000032
Wherein R is11、R12And R13Independently selected from any one of substituted phenyl, substituted biphenyl, substituted naphthyl, substituted anthryl, substituted phenanthryl and substituted fluorenyl, and the substituent is independently selected from C1～C18Alkyl, preferably said electron withdrawing group substituent substituted R11，R12And R13At least one of (a).
Further, the particle size of the luminescent material is 1 to 15 μm, preferably 8 to 14 μm.
Further, the light-emitting layer comprises a main body layer and a light-emitting material dispersed in the main body layer, the light-emitting material comprises the light-emitting material with the electron-withdrawing group, the material for forming the main body layer comprises a light-curing resin, and the weight ratio of the light-emitting material to the light-curing resin is preferably 1: 10-100.
Further, the material forming the body layer also includes an ultraviolet absorber and/or an antioxidant.
Further, the transparent display film may further include a barrier layer provided on a side of the light-emitting layer away from the base material layer, and the barrier layer preferably includes any one or more of silicon dioxide, magnesium oxide, aluminum oxide, titanium oxide, tin oxide, zirconium oxide, indium tin oxide, boron nitride, silicon nitride, yttrium oxide, zinc sulfide, an ultraviolet absorber, a radical scavenger, and an antioxidant.
Further, the transparent display film further comprises a protective layer arranged on one side, far away from the base material layer, of the barrier layer, and the protective layer is preferably a PET layer, a PVC layer, a PP layer or a PE layer.
Furthermore, the transparent display film further comprises a release layer arranged on the side, far away from the luminescent layer, of the substrate layer.
By applying the technical scheme of the invention, the transparent display film comprising the substrate layer and the light-emitting layer which are sequentially laminated is provided, and the light-emitting layer comprises the light-emitting material introduced with the electron-withdrawing group, so that the excitation spectrum of the light-emitting material is subjected to blue shift by introducing the electron-withdrawing group, the transparent display film can self-emit light under the irradiation of the excitation light of the exciter, the ground color of the transparent display film is reduced, and the attractiveness of the transparent display film is ensured.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic cross-sectional view illustrating a transparent display film according to an embodiment of the present invention.
Wherein the figures include the following reference numerals:
10. a substrate layer; 20. a light emitting layer; 30. a barrier layer; 40. a protective layer; 50. and a release layer.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As can be seen from the background art, the film applied to the transparent display technology in the prior art has a background color due to the excitation of the luminescent material in a wide wavelength band, and the presence of the background color affects the beauty of the film, thereby limiting the further application of the transparent display film. The inventors of the present invention have studied in view of the above problems and have provided a transparent display film, as shown in fig. 1, comprising a base material layer 10 and a light-emitting layer 20 sequentially laminated, wherein a light-emitting material having the electron-withdrawing group is provided in the light-emitting layer 20, and the light-emitting material emits visible light under irradiation of excitation light of an exciter.
The transparent display film also comprises the luminescent material introduced with the electron-withdrawing group, so that the excitation spectrum of the luminescent material is subjected to blue shift by introducing the electron-withdrawing group, the transparent display film can self-emit light under the irradiation of the excitation light of the exciter, the ground color of the transparent display film is reduced, and the attractiveness of the transparent display film is ensured.
The exciter is used for projecting ultraviolet light, infrared light or visible light to excite the transparent display film provided with the luminescent material, so that the luminescent material emits the visible light. The exciter may be selected from any one or more of an exciter digital projector, a microarray projector, a digital light processing projector, a liquid crystal display projector, and a liquid crystal on silicon projector, but is not limited to the above, and those skilled in the art can select the type of projector appropriately according to the prior art. Preferably, the wavelength of the excitation light emitted by the exciter is controlled to be 380-430 nm, the excitation light with the wavelength is less irritating to human eyes, and the light is softer, so that damage to the human eyes when the light irradiates the transparent display film is reduced.
In the transparent display film of the present invention, in order to more efficiently blue-shift the excitation spectrum, in a preferred embodiment, the electron-withdrawing group is one or more selected from the group consisting of a naphthyl substituent, an anthryl substituent, a heterocyclic compound and a phenyl substituent having a benzene ring bonded to-COOH, -OH, -NO and-COOH2、-CHO、-OH、-OCH3、-NHCOCH3、-C6H5Any one or more of. The above-mentioned electron-withdrawing group is limited to the above-mentioned preferred species, and it is possible to effectively ensure blue shift of the excitation spectrum of the light-emitting material by disturbing the degree of conjugation of the light-emitting material.
In the above transparent display film of the present invention, in order to enable the light emitting material to emit blue light under irradiation of excitation light of the exciter, preferably, the above light emitting material emitting blue light is selected from any one or more of a compound a, a compound B and a compound C, the compound a is a material in which the structural formula shown in formula I is substituted by the electron withdrawing group, the compound B is a material in which the structural formula shown in formula II is substituted by the electron withdrawing group, the compound B is a material in which the structural formula shown in formula III is substituted by the electron withdrawing group:
Figure BDA0001280259520000051
wherein Ar is1～Ar12Independently selected from H, C6～C30Substituted or unsubstituted aromatic hydrocarbon radical, C6～C30Substituted or unsubstituted fused ring aromatic hydrocarbon group of (A), C6～C30Substituted or unsubstituted fused heterocyclic group, five-membered, six-membered heterocyclic ring or substituted heterocyclic ring, triarylamine group, aryl ether group, C1～C12And Ar is any one of a substituted or unsubstituted aliphatic alkyl group of (a), and1～Ar8not simultaneously being H or Ar13Is selected from C6～C30Substituted or unsubstituted aromatic hydrocarbon radical, C6～C30Substituted or unsubstituted fused ring aromatic hydrocarbon group of (A), C1～C12The electron-withdrawing group in the formula I can replace Ar1And Ar5At least one of the electron-withdrawing groups described in formula II may be substituted for Ar4And Ar8Wherein the electron-withdrawing group in the formula III may be substituted for Ar13。
In the above transparent display film of the present invention, in order to enable the light emitting material to emit red light under irradiation of excitation light of the exciter, preferably, the above light emitting material emitting red light is selected from any one or more of a compound E, a compound F, and a compound G, the compound E is a material in which the structural formula shown in formula IV is substituted by the electron withdrawing group, the compound F is a material in which the structural formula shown in formula V is substituted by the electron withdrawing group, and the compound G is a material in which the structural formula shown in formula VI is substituted by the electron withdrawing group:
Figure BDA0001280259520000061
wherein Ar is14And Ar15Independently selected from H, C6～C20Aromatic group of (2), C4～C20And C4～C20Any one of the condensed ring aromatic groups of (A), Ar14And Ar15Not simultaneously being a hydrogen atom or a 4- (2, 2-diphenylvinyl) -substituted phenyl group, R7～R10Independently selected from H, C1～C30Alkyl and C6～C20N is an integer of 1 to 4, and the electron-withdrawing groups in the formulae IV, V and VI can replace Ar14And Ar15At least one of (a).
For example, the above-mentioned red light-emitting luminescent material may be
Figure BDA0001280259520000062
Which is that
Figure BDA0001280259520000063
Materials formed via substitution of electron withdrawing groups.
In the above transparent display film of the present invention, in order to enable the light-emitting material to emit green light under irradiation of excitation light from the exciter, it is preferable that the above green light-emitting material is selected from the group consisting of a green light-emitting material host material having the electron-withdrawing group described above and a luminescent material host material for emitting green light including
Figure BDA0001280259520000071
Wherein R is11、R12And R13Independently selected from any one of substituted phenyl, substituted biphenyl, substituted naphthyl, substituted anthryl, substituted phenanthryl and substituted fluorenyl, and the substituent is independently selected from C1～C18Alkyl, and said electron withdrawing group substituent substituted for R11，R12And R13At least one of (a). For example, the above-mentioned green light-emitting luminescent material may be
Figure BDA0001280259520000072
Which is that
Figure BDA0001280259520000073
Materials formed via substitution of said electron withdrawing groups.
In the transparent display film of the present invention, in order to further improve the light emission efficiency of the transparent display film, the particle size of the light emitting material is preferably 1 to 15 μm, and more preferably 8 to 14 μm. By optimizing the particle size of the luminescent material, the transparent display film can have the luminous efficiency of 80-93.4%, and the problem of low light transmittance of the transparent display film is effectively solved. The above-mentioned luminous efficiency is also called internal quantum efficiency, and the internal quantum efficiency generally refers to the ratio of collected electrons to absorbed photons when the photons are incident on the surface of the photosensitive element and the absorbed photons excite the photosensitive material to generate electron-hole pairs, thereby forming current.
In the above transparent display film of the present invention, the light emitting layer 20 includes a host layer and a light emitting material dispersed in the host layer, the light emitting material includes the above light emitting material having an electron withdrawing group, and preferably, the material forming the above host layer may further include a photocurable resin. In this case, the light-emitting material is provided in a photocurable resin, and the light-emitting layer 20 is formed by photocuring. The weight ratio of the light-emitting material to the light-curing resin can be limited by actual requirements of those skilled in the art, and in order to improve the light-emitting efficiency of the transparent display film, the weight ratio of the light-emitting material to the light-curing resin is preferably 1: 10-100. Further, in order to improve the photocurability of the above-mentioned photocurable resin, the photocurable resin is preferably a thermosetting isocyanate-based curing agent, more preferably a general-purpose isocyanate-based curing agent L-45 (45% isocyanate) or a general-purpose isocyanate-based curing agent L-75 (75% isocyanate), and any of these curing agent materials can be commercially available.
The material of the host layer for forming the light emitting layer 20 may be further limited by those skilled in the art according to actual requirements, and preferably, the material for forming the host layer further includes an ultraviolet absorber and/or an antioxidant. The transparent display film can absorb more ultraviolet rays by using the ultraviolet absorber, so that the luminous efficiency of the transparent display film is further improved; the antioxidant can delay or inhibit the oxidation process of the light-cured resin, thereby effectively preventing the aging of the transparent display film and prolonging the service life of the transparent display film.
In the transparent display film of the present invention, it is preferable that the transparent display film further includes a barrier layer 30 provided on a side of the light-emitting layer 20 away from the base material layer 10. In order to make the barrier layer 30 achieve the effect of blocking water, oxygen and/or ultraviolet rays, the barrier layer 30 may include one or more kinds of functional particles, and those skilled in the art can select the kinds of the functional particles according to actual needs, and preferably, the barrier layer 30 includes any one or more of silicon dioxide, magnesium oxide, aluminum oxide, titanium oxide, tin oxide, zirconium oxide, indium tin oxide, boron nitride, silicon nitride, yttrium oxide, zinc sulfide, an ultraviolet absorbent, a radical scavenger, and an antioxidant.
In the above-described transparent display film of the present invention, it is preferable that the transparent display film further includes a protective layer 40 provided on a side of the barrier layer 30 away from the substrate layer 10. The protective layer 40 can effectively protect the barrier layer 30 from being scratched, and a person skilled in the art can select the type of the protective layer 40 according to the prior art, and preferably, the protective layer 40 is a PET layer, a TAC layer, a PMMA layer, a PVC layer, a PC layer, a PE layer or a PP layer; also, in order to secure the light emitting efficiency of the transparent display film, it is more preferable that the protective layer 40 has a visible light transmittance of more than 90% and a haze of less than 1%.
In the above transparent display film of the present invention, preferably, the transparent display film further includes a release layer 50 disposed on a side of the substrate layer 10 away from the light-emitting layer 20. The release layer 50 not only can make the transparent display film adhere to a desired object such as a glass surface, but also can make the transparent display film easily separate from the object surface, and those skilled in the art can select the release layer 50 according to the prior art.
The method for preparing the transparent display film may include the steps of:
step S1, a light emitting layer 20 is disposed on the substrate layer 10, a light emitting material having an electron withdrawing group is disposed in the light emitting layer 20, and the light emitting material emits one or two of blue light, green light, and red light under the irradiation of the excitation light of the exciter. In a preferred embodiment, a 1-100 μm glue layer is coated on a PET substrate (thickness is 15-150 μm) with a release layer, the luminescent material with electron-withdrawing groups is added into the glue solution, and an ultraviolet absorbent and/or an antioxidant can be added, wherein the weight ratio of macromolecules to the glue solution is 1: 10-100, and the glue solution is coated on the PET substrate after being uniformly mixed.
In step S2, a barrier layer 30 is provided on the side of the light-emitting layer 20 away from the base material layer 10. In a preferred embodiment, the barrier layer 30 is formed to have a thickness of 3 to 25 μm by spray coating, flow coating or vapor deposition, and the barrier layer 30 may include one or more of silicon dioxide, magnesium oxide, aluminum oxide, titanium oxide, tin oxide, zirconium oxide, indium tin oxide, boron nitride, silicon nitride, yttrium oxide, zinc sulfide, an ultraviolet absorber, a radical scavenger and an antioxidant.
In step S3, the protective layer 40 is provided on the side of the barrier layer 30 away from the substrate layer 10. In a preferred embodiment, a subbing layer, preferably a glue solution containing any one or more of uv absorbers, radical scavengers, and antioxidants, is applied to the barrier layer 30 by coating, screen printing, ink jet printing, casting, or gravure coating, and a scratch resistant PET layer is laminated to the subbing layer.
The transparent display film provided by the present invention will be further described with reference to examples.
Comparative example 1
The transparent display film provided by the comparative example comprises a base material layer and a light-emitting layer which are laminated, wherein a light-emitting material which emits blue light under the irradiation of exciting light of an exciter is arranged in the light-emitting layer
Figure BDA0001280259520000091
The particle size is 0.8 μm, the material for forming the luminous layer comprises light-cured resin (isocyanate curing agent L-45), the weight ratio of the luminous material to the light-cured resin is 1:5, and the base material layer is a PET base material.
Example 1
The transparent display film provided in this example differs from comparative example 1 in that:
the luminescent material is
Figure BDA0001280259520000092
Comparative example 2
The present comparative example provides a transparent display film that differs from example 1 in that:
the luminescent layer is provided with a luminescent material which emits red light under the irradiation of exciting light of the exciter
Figure BDA0001280259520000093
The particle size is 1 μm, and the weight ratio of the luminescent material to the light-curing resin is 1: 5.
Example 2
The present example provides a transparent display film different from example 2 in that:
the luminescent material is
Figure BDA0001280259520000101
Comparative example 3
The present comparative example provides a transparent display film that differs from example 1 in that:
the luminescent layer is provided with a luminescent material which emits green light under the irradiation of the exciting light of the exciter
Figure BDA0001280259520000102
The particle size was 15 μm, and the weight ratio of the light-emitting material to the photocurable resin was 1: 10.
Example 3
The transparent display film provided in this example differs from comparative example 3 in that:
the luminescent material is
Figure BDA0001280259520000103
Example 4
The present comparative example provides a transparent display film that differs from example 1 in that:
the luminescent layer is provided with a luminescent material which emits red light and a luminescent material which emits green light under the irradiation of exciting light of the exciter
Figure BDA0001280259520000111
The particle diameter is 8 μm, and the green light emitting material is
Figure BDA0001280259520000112
The particle size was 14 μm, and the weight ratio of the above light-emitting material including the red light-emitting material and the green light-emitting material to the photocurable resin was 1: 100.
Example 5
The transparent display film provided in this example differs from comparative example 1 in that:
the luminescent layer is provided with a luminescent material which emits red light and a luminescent material which emits green light under the irradiation of exciting light of the exciter
Figure BDA0001280259520000113
The particle diameter is 8 μm, and the green light emitting material is
Figure BDA0001280259520000114
The particle size is 14 μm, and the above materials include red light emitting material and green light emitting materialThe weight ratio of the luminescent material to the light-cured resin of the material is 1: 100.
Example 6
The present comparative example provides a transparent display film that differs from example 1 in that:
the luminescent layer is provided with a luminescent material which emits blue light, a luminescent material which emits red light and a luminescent material which emits green light under the irradiation of exciting light of the exciter, and the blue light luminescent material is
Figure BDA0001280259520000121
The particle diameter is 10 mu m, and the red light luminescent material is
Figure BDA0001280259520000122
The particle diameter is 10 μm, and the green light emitting material is
Figure BDA0001280259520000123
The particle size is 10 mu m, the weight ratio of the luminescent material comprising the blue luminescent material, the red luminescent material and the green luminescent material to the light-cured resin is 1:50, and the light-cured resin is isocyanate curing agent L-75.
Example 7
The present example provides a transparent display film different from example 1 in that:
the luminescent layer is provided with a luminescent material which emits blue light, a luminescent material which emits red light and a luminescent material which emits green light under the irradiation of exciting light of the exciter, and the blue light luminescent material is
Figure BDA0001280259520000124
The particle diameter is 10 mu m, and the red light luminescent material is
Figure BDA0001280259520000125
The particle diameter is 10 μm, and the green light emitting material is
Figure BDA0001280259520000131
The particle diameter is 10 μm, and the weight ratio of the luminescent material comprising the blue luminescent material, the red luminescent material and the green luminescent material to the light-cured resin is 1:50, the light-cured resin is isocyanate curing agent L-75.
Example 8
The present example provides a transparent display film different from example 5 in that:
the transparent display film comprises a base material layer, a luminous layer and a blocking layer which are laminated, wherein materials for forming the blocking layer comprise light-cured resin, silica particles (the manufacturer is Shanghai titanium chemical products, Ltd.) with the particle size of 100nm and ultraviolet absorbent uv-531 (2-hydroxy-4-n-octoxybenzophenone) which are arranged in the light-cured resin.
The transparent films of examples 1 to 8 and comparative examples 1 to 3 were measured for transmittance, haze and yellowing value using a HunterLab spectrophotometer by irradiating the transparent films with 150mw of surface laser as an excitation light source at 380 to 430nm, while the transparent films of examples 1 to 8 and comparative examples 1 to 3 were measured for quantum efficiency using an Otsuka electron QE-2000 quantum efficiency instrument, and the results are shown in the following table:
Figure BDA0001280259520000132
Figure BDA0001280259520000141
as can be seen from the above test results, the transparent display films in examples 1 to 8 of the present application can have higher transmittance, higher luminous efficiency and lower haze than those of comparative examples 1 to 3, respectively, and example 8 can also have higher transmittance, higher luminous efficiency and lower haze than example 7. Also, the transparent display films in examples 1 to 8 and comparative examples 1 to 3 described above were observed by human eyes, and it can be seen from the observation results that the transparent display films in examples 1 to 8 have higher transparency than the transparent display films in comparative examples 1 to 3, thereby reducing the ground color of the transparent display films.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the excitation spectrum of the luminescent material is blue-shifted by introducing the electron-withdrawing group, so that the transparent display film can self-illuminate under the irradiation of the excitation light of the exciter, the ground color of the transparent display film is reduced, and the attractiveness of the transparent display film is ensured;
2. by limiting the particle size of the luminescent material to 1-15 μm, the transparent display film can have a luminous efficiency of 80-93.4%, and the problem of low light transmittance of the transparent display film is effectively solved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A transparent display film comprising a substrate layer (10) and a light-emitting layer (20) laminated in this order, wherein a light-emitting material having an electron-withdrawing group is provided in the light-emitting layer (20), the light-emitting material emitting visible light under irradiation of excitation light from an exciter,
the luminescent material emits blue light under the irradiation of exciting light of the exciter, the luminescent material is selected from any one or more of a compound A, a compound B and a compound C, the compound A is a material formed by the structural formula shown in the formula I through the substitution of the electron-withdrawing group, the compound B is a material formed by the structural formula shown in the formula II through the substitution of the electron-withdrawing group, and the compound C is a material formed by the structural formula shown in the formula III through the substitution of the electron-withdrawing group:
Figure DEST_PATH_IMAGE001
；
Figure 458018DEST_PATH_IMAGE002
；
formula I formula II
Figure DEST_PATH_IMAGE003
Formula III
Wherein Ar is1~Ar12Independently selected from H, C6～C30Substituted or unsubstituted aromatic hydrocarbon radical, C6～C30Substituted or unsubstituted fused ring aromatic hydrocarbon group of (A), C6～C30Substituted or unsubstituted fused heterocyclic group, five-membered, six-membered heterocyclic ring or substituted heterocyclic ring, triarylamine group, aryl ether group, C1～C12And Ar is any one of a substituted or unsubstituted aliphatic alkyl group of (a), and1~Ar8not simultaneously being H or Ar13Is selected from C6～C30Substituted or unsubstituted aromatic hydrocarbon radical, C6～C30Substituted or unsubstituted fused ring aromatic hydrocarbon group of (A), C1～C12Any one of substituted or unsubstituted aliphatic alkyl groups of (a); or
The luminescent material emits red light under the irradiation of the exciting light of the exciter, the luminescent material is selected from any one or more of a compound E, a compound F and a compound G, and the compound E is of a formula
Figure 594601DEST_PATH_IMAGE004
The structural formula is a material formed by substituting the electron-withdrawing group, and the compound F is the formula
Figure DEST_PATH_IMAGE005
The structural formula is a material formed by substituting the electron-withdrawing group, and the compound G is the formula
Figure 932654DEST_PATH_IMAGE006
A material formed via substitution of the electron withdrawing group of the formula:
Figure DEST_PATH_IMAGE007
；
Figure 598122DEST_PATH_IMAGE008
；
Figure DEST_PATH_IMAGE009
formula (II)
Figure 290134DEST_PATH_IMAGE004
Formula (II)
Figure 230408DEST_PATH_IMAGE005
Formula (II)
Figure 222635DEST_PATH_IMAGE006
Wherein Ar is14And Ar15Independently selected from H, C6～C20Aromatic group of (2), C4～C20And C4～C20Any one of the condensed ring aromatic groups of (A), Ar14And Ar15Not simultaneously being a hydrogen atom or a 4- (2, 2-diphenylvinyl) -substituted phenyl group, R7~R10Independently selected from H, C1～C30Alkyl and C6～C20N is equal to any integer of 1-4; or
The luminescent material emits green light under the irradiation of the exciting light of the exciter, and the luminescent material is selected from the luminescent material host material which has electron-withdrawing groups and emits green light and comprises
Figure 855742DEST_PATH_IMAGE010
Wherein R is11、R12And R13Independently selected from any of substituted phenyl, substituted biphenyl, substituted naphthyl, substituted anthracyl, substituted phenanthryl and substituted fluorenylThat is, the substituents are independently selected from C1～C18The electron-withdrawing group is selected from one or more of naphthyl substituent, anthryl substituent, heterocyclic compound and phenyl substituent, and the benzene ring of the phenyl substituent is connected with-COOH, -OH and-NO2、-CHO、-OH、-OCH3、-NHCOCH3、-C6H5Any one or more of (a) to (b),
ar substituted by electron-withdrawing group in the formula I1And Ar5At least one of the above-mentioned (b),
ar substituted by electron-withdrawing group in the formula II4And Ar8At least one of the above-mentioned (b),
ar substituted by electron-withdrawing group in the formula III13，
Said formula
Figure 35050DEST_PATH_IMAGE004
The formula
Figure 779016DEST_PATH_IMAGE005
And said formula
Figure 891328DEST_PATH_IMAGE006
Ar substituted by middle electron-withdrawing group14And Ar15At least one of the above-mentioned (b),
the electron-withdrawing group substituent group is used for substituting R11，R12And R13At least one of (a).
2. The transparent display film according to claim 1, wherein the particle size of the light-emitting material is 1 to 15 μm.
3. The transparent display film according to claim 2, wherein the particle size of the light-emitting material is 8 to 14 μm.
4. The transparent display film according to claim 1, wherein the light-emitting layer (20) comprises a host layer and a light-emitting material dispersed in the host layer, the light-emitting material comprises the light-emitting material having an electron-withdrawing group, and a material forming the host layer comprises a photocurable resin.
5. The transparent display film according to claim 4, wherein a weight ratio of the light-emitting material to the photocurable resin is 1:10 to 100.
6. The transparent display film of claim 4, wherein the material forming the body layer further comprises an ultraviolet absorber and/or an antioxidant.
7. The transparent display film according to claim 1, further comprising a barrier layer (30) disposed on a side of the light-emitting layer (20) remote from the substrate layer (10).
8. The transparent display film of claim 7, wherein the barrier layer (30) comprises any one or more of silicon dioxide, magnesium oxide, aluminum oxide, titanium oxide, tin oxide, zirconium oxide, indium tin oxide, boron nitride, silicon nitride, yttrium oxide, zinc sulfide, ultraviolet absorbers, radical scavengers, and antioxidants.
9. The transparent display film according to claim 7, further comprising a protective layer (40) disposed on a side of the barrier layer (30) remote from the substrate layer (10).
10. The transparent display film according to claim 9, wherein the protective layer (40) is a PET layer, a PVC layer, a PP layer or a PE layer.
11. The transparent display film according to claim 1, further comprising a release layer (50) disposed on a side of the substrate layer (10) away from the light-emitting layer (20).
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