CN100421278C - Organic LED luminous layer and organic LED display panel using same - Google Patents
Organic LED luminous layer and organic LED display panel using same Download PDFInfo
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- CN100421278C CN100421278C CNB2005100754940A CN200510075494A CN100421278C CN 100421278 C CN100421278 C CN 100421278C CN B2005100754940 A CNB2005100754940 A CN B2005100754940A CN 200510075494 A CN200510075494 A CN 200510075494A CN 100421278 C CN100421278 C CN 100421278C
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Abstract
The present invention relates to a luminous layer of an organic LED, which is used for emitting white light. The present invention comprises a host luminous body, a first guest luminous body and a second guest luminous body, wherein the luminous wavelength of the host luminous body is about 300 nanometers to 530 nanometers; the luminous wavelength of the first guest luminous body is about 300 nanometers to 530 nanometers; the luminous wavelength of the second guest luminous body is about 530 nanometers to 720 nanometers.
Description
[technical field]
The invention relates to a kind of luminescent layer material, and particularly relevant for a kind of luminescent layer material that is applied to Organic Light Emitting Diode.
[background technology]
Traditional Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) display floater is the multilayer stack architecture, anode, electric hole transport layer, luminescence component, electron transfer layer and negative electrode system are arranged on the substrate in regular turn. and luminescence component comprises host and guest's doped system, and a spot of guest emitter promptly mixes in host emitter.
When negative electrode and anode are applied in a voltage, electronics will inject luminescent layer in the mode by electron transfer layer by negative electrode, the electricity hole will be by anode to inject luminescent layer by the mode of electric hole transport layer, electronics and electric hole can cause host emitter to be energized into excite state by ground state after the combination in luminescent layer. owing to be in the host emitter instability of excite state, so host emitter must turn back to ground state by excite state, and give guest emitter with energy delivery.
When being energized into excite state when the guest emitter received energy and by ground state, guest emitter will produce singlet state exciton (singlet excition) and triplet exciton (triplet excition). because the distributive law of electron spin attitude, the capital causes the formation probability of triplet exciton and singlet state exciton to be about 3: 1. singlet state exciton or triplet exciton will return stable ground state with the form that discharges photon, make Organic Light Emitting Diode produce the phenomenon of electroluminescence.
Luminescence component system sends white light, and mixed by the light of two or more wavelength. what the mode of mixed white light was general common has two kinds, a kind of for mixing bluish-green coloured light and sodium yellow, another kind is a mixture of red coloured light, green light and blue light. traditional luminescence component is divided into three kinds according to structure. and first kind of luminescence component is three layers of host emitter ruddiness of arranging in pairs or groups separately, green glow, the three-decker of the guest emitter of blue light, the luminous series of strata of each layer are luminous ruddiness respectively, the primaries of green glow and blue light is to be mixed into white light. and second kind of luminescence component is the double-decker of host emitter collocation blue light guest emitter and host emitter collocation ruddiness guest emitter. and the third luminescence component is the single layer structure of blue light host emitter collocation gold-tinted or ruddiness guest emitter.
Yet, though luminescence component such as double-decker or three-decker can obtain high efficiency and pure white photochromic, but the processing procedure deflection is complicated. in addition, the luminescence component of single layer structure, though its processing procedure is easy, but luminous efficiency is not high, causes the not high and photochromic problem such as impure of white light efficient easily. therefore, how to take into account and simplify processing procedure and promote that photochromic efficient is real to be current important topic.
[summary of the invention]
In view of this, purpose of the present invention is exactly at the Organic Light Emitting Diode that a kind of luminescent layer material and application thereof are provided, the luminescent layer material is the individual layer luminous layer structure that a kind of host emitter and a kind of guest emitter mix, the guest emitter system of blue light to the host emitter of blue green light and ruddiness to gold-tinted mixes with special ratios, in order to send pure white coloured light. moreover, luminescent layer material of the present invention more comprises another guest emitter, its light emitting region is between the blue green light scope, in order to send pure white coloured light and to improve luminous efficiency between blue light.
According to purpose of the present invention, a kind of luminescent layer of Organic Light Emitting Diode is proposed, in order to send a white light, the material of this luminescent layer comprises host emitter, first guest emitter and second guest emitter. host emitter, its emission wavelength is approximately between 300 nanometer to 530 nanometers, system is in order to send blue light or approximate blue light. first guest emitter, its emission wavelength is approximately between 300 nanometer to 530 nanometers, system is in order to send blue light, approximate blue light or blue green light. second guest emitter, its emission wavelength is in order to send ruddiness or gold-tinted approximately between 530 nanometer to 720 nanometers.
According to purpose of the present invention, reintroduce a kind of luminescent layer of Organic Light Emitting Diode, in order to send a white light, this luminescent layer material comprises a host emitter and a guest emitter. a host emitter, its emission wavelength is in order to send blue light or approximate blue light approximately between 300 nanometer to 530 nanometers. guest emitter, its emission wavelength are approximately between 530 nanometer to 720 nanometers, system is in order to sending ruddiness or gold-tinted, and the doping volume ratio of this guest emitter is approximately between 0.01%～5%.
According to purpose of the present invention, a kind of organic LED display panel is proposed again, comprise first board unit, second board unit and adhesive agent.First board unit comprises first substrate, anode and relative negative electrode, luminescent layer, electron transfer layer and electric hole transport layer. and anode and relative negative electrode system are arranged on this first substrate. and luminous series of strata are arranged between this anode and this negative electrode, in order to produce a white light. and luminescent layer comprises host emitter and guest emitter; The emission wavelength of host emitter is in order to send blue light or approximate blue light approximately between 300 nanometer to 530 nanometers; The emission wavelength of guest emitter is approximately between 530 nanometer to 720 nanometers, system is in order to send ruddiness or gold-tinted, and the doping volume ratio of this guest emitter approximately is arranged between this luminescent layer and this anode between 0.01%～5%. electric hole transmission series of strata. and the electric transmission series of strata are arranged between this luminescent layer and this negative electrode. and second board unit comprises one second substrate at least, and this second board unit system is relatively arranged on this first board unit. and adhesive agent is arranged between this first substrate and this second substrate.
According to purpose of the present invention, a kind of organic LED display panel is more proposed, comprise first board unit, second board unit and adhesive agent. first board unit comprises first substrate, anode and relative negative electrode, luminescent layer, electron transfer layer and electric hole transport layer. anode and relative negative electrode system are arranged on this first substrate. and the material of this luminescent layer comprises host emitter, first guest emitter and second guest emitter. host emitter, its emission wavelength is approximately between 300 nanometer to 530 nanometers, system is in order to send blue light or approximate blue light. first guest emitter, its emission wavelength is in order to send blue light approximately between 300 nanometer to 530 nanometers, approximate blue light or blue green light.Second guest emitter, its emission wavelength are in order to send ruddiness or gold-tinted approximately between 530 nanometer to 720 nanometers.
According to purpose of the present invention, reintroduce a kind of luminescent layer of Organic Light Emitting Diode, in order to send a white light, the material of this luminescent layer comprises host emitter, first guest emitter and second guest emitter. the highest electronics orbital (the HighestOccupied Molecular Orbital that fills out of this first guest emitter wherein; HOMO) absolute value system is less than or equal to the HOMO absolute value of this host emitter, and minimum electronics orbital (the Lowest Unoccupied Molecular Orbital that do not fill out of this first guest emitter; LUMO) absolute value system is more than or equal to the LUMO absolute value of this host emitter. and the HOMO absolute value system of this second guest emitter is less than or equal to the HOMO absolute value of this first guest emitter, and the LUMO absolute value of this second guest emitter system is more than or equal to the LUMO absolute value of this first guest emitter. the HOMO absolute value system of this host emitter is more than or equal to the HOMO absolute value of this electricity hole transport layer, and the LUMO absolute value of this host emitter system is less than or equal to the LUMO absolute value of this electron transfer layer.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below:
[description of drawings]
Fig. 1 illustrates a kind of schematic diagram according to the organic LED display panel of a preferred embodiment of the present invention.
Fig. 2 illustrates the graph of a relation according to the luminous efficiency and the current density of preferred embodiment of the present invention.
Fig. 3 A illustrates the driving voltage and the chromaticity coordinate value (CIE of preferred embodiment of the present invention
X) graph of a relation.
Fig. 3 B illustrates the driving voltage and the chromaticity coordinate value (CIE of preferred embodiment of the present invention
Y) graph of a relation.
Fig. 4 illustrates according to the relative brightness of preferred embodiment of the present invention and the graph of a relation of operating time.
[embodiment]
Main conception of the present invention, the individual layer luminous layer structure that system adopts a kind of host emitter and a kind of guest emitter material to mix with special ratios, the main light emission system is in order to send blue light or blue green light, guest emitter system is in order to send ruddiness or gold-tinted, send pure white coloured light with mixing. moreover, luminescent layer material of the present invention more comprises another guest emitter, and its light emitting region is blue light or blue green light, mixes the back with host emitter in order to send pure white coloured light and to improve luminous efficiency.Below be to describe for example for several groups of embodiment, so these a little embodiment can't limit desire protection range of the present invention.
The luminescent layer of the Organic Light Emitting Diode of present embodiment, in order to send a white light, the luminescent layer material comprises host emitter and guest emitter at least.The emission wavelength of host emitter is approximately between 300 nanometer to 530 nanometers, preferably between 360 nanometer to 480 nanometers. the emission wavelength of guest emitter is approximately between 530 nanometer to 720 nanometers, preferably between 530 nanometer to 700 nanometers. and send the host emitter of blue light or blue green light and the guest emitter system of luminous ruddiness or gold-tinted and blend white light.The doping volume ratio of guest emitter is approximately between 0.01%～5%, preferably between 0.1% to 5%.
The highest electronics orbital (the Highest Occupied MolecularOrbital that fills out of guest emitter; HOMO) absolute value system is less than or equal to the HOMO absolute value of host emitter, and minimum electronics orbital (the Lowest Unoccupied MolecularOrbital that do not fill out of guest emitter; LUMO) absolute value system is more than or equal to the LUMO absolute value of host emitter.
The molecular weight of host emitter and guest emitter for example is to comprise MADN (2-methy1-9 less than 1000. host emitters approximately, 10-di (2-naphthyl) anthracene). guest emitter for example is to comprise DCJTB (4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyl-julolidyl-9-enyl)-4H-pyran)) or the chemical structural formula of Perylene derivative .MADN and DCJTB disclose as follows.
In another embodiment, the luminescent layer material comprises one first guest emitter and one second guest emitter.The emission wavelength of first guest emitter is approximately between 300 nanometer to 530 nanometers, preferably between 360 nanometer to 480 nanometers.The doping volume ratio of first guest emitter is approximately between 0.01% to 50%, preferably identical in fact with the emission wavelength system of host emitter between 0.1% to 20%. first guest emitter, scope between blue light or blue green light. the first guest emitter Strengthenable blue light, help to blend pure white photochromic, improve the efficient of emission white light.The emission wavelength of second guest emitter preferably between 530 nanometer to 700 nanometers, is in order to send ruddiness or gold-tinted approximately between 530 nanometer to 720 nanometers.
The HOMO absolute value system of first guest emitter is more than or equal to the HOMO absolute value of second guest emitter, and the LUMO absolute value of first guest emitter is less than or equal to the LUMO absolute value of second guest emitter.
Moreover the molecular weight of host emitter, first guest emitter or second guest emitter is approximately less than 1000. preferably, and the molecular weight of first guest emitter and second guest emitter is approximately less than 1000.
Luminescent layer material of the present invention preferably is applied to organic LED display panel.Please refer to Fig. 1, it illustrates a kind of schematic diagram according to the organic LED display panel of a preferred embodiment of the present invention.The organic LED display panel 100 of present embodiment comprises that first board unit 110, second board unit 130 and adhesive agent 126. first board units comprise first substrate 111, anode 112 and relative negative electrode 120, luminescent layer 116, electric hole transport layer 114 and electron transfer layer 118.Anode 112 and relative negative electrode 120, system is arranged on first substrate 111. as shown in Figure 1, anode 112 is to be arranged on first substrate 111, cording has the multilayer stack architecture between negative electrode 120 and the anode 112. and anode 112 for example is to comprise indium tin oxide (Indium Tin Oxide, ITO). luminescent layer 116 is to be arranged between anode 112 and the negative electrode 122, in order to produce a white light. luminescent layer comprises host emitter and guest emitter at least. and the emission wavelength of host emitter is approximately between 300 nanometer to 530 nanometers. and the emission wavelength of guest emitter is approximately between 530 nanometer to 720 nanometers, and the doping volume ratio of guest emitter is approximately between 0.01%～5%, preferably between 0.1%～5%.Electricity hole transport layer 114 is to be provided with on the anode 112, and between luminescent layer 116 and anode 112.Electron transfer layer 118 is to be formed on the luminescent layer 116, and between luminescent layer 116 and the negative electrode 120. it is to be relatively arranged on first board unit, 110. adhesive agents 126 to be arranged between first substrate 111 and second substrate 132 that second board unit 130 comprises second substrate, 132, the second board units 130 at least.
Preferably, the luminescent layer material comprises one first guest emitter and one second guest emitter.The emission wavelength of first guest emitter is approximately between 300 nanometer to 530 nanometers, preferably between 360 nanometer to 480 nanometers. the doping volume ratio of first guest emitter is approximately between 0.01% to 50%, preferably identical in fact with the emission wavelength system of host emitter between 0.1% to 20%. first guest emitter, scope between blue light or blue green light. the first guest emitter Strengthenable blue light, help to blend pure white photochromic, improve the efficient of emission white light.The emission wavelength of second guest emitter is approximately between 530 nanometer to 720 nanometers, preferably between 530 nanometer to 700 nanometers, system is in order to send ruddiness or gold-tinted. and the HOMO absolute value system of second guest emitter is less than or equal to the HOMO absolute value of first guest emitter, and the LUMO absolute value of second guest emitter system is more than or equal to the LUMO absolute value of first guest emitter.The HOMO absolute value system of host emitter is more than or equal to the HOMO absolute value of electric hole transport layer, and the LUMO absolute value of host emitter system is less than or equal to the LUMO absolute value of electron transfer layer.
When negative electrode 120 and anode 111 are applied in a voltage, electronics will be by negative electrode to inject luminescent layer 116 by the mode of electron transfer layer 118, the electricity hole will be by anode 112 to inject luminescent layer 116 by the mode of electric hole transport layer 114, electronics and electric hole can cause host emitter to be energized into excite state by ground state after the combination in luminescent layer 116. owing to be in the host emitter instability of excite state, so host emitter must turn back to ground state by excite state, and give guest emitter with energy delivery.
When being energized into excite state when the guest emitter received energy and by ground state, guest emitter will produce singlet state exciton (singlet excition) and triplet exciton (triplet excition). because the distributive law of electron spin attitude all can cause the formation probability of triplet exciton and singlet state exciton to be about 3: 1.Singlet state exciton or triplet exciton will return stable ground state with the form that discharges photon, make Organic Light Emitting Diode produce the phenomenon of electroluminescence.
Second board unit 130 more comprises a colored filter 134, is to be arranged on second substrate 132.The white light system that luminescent layer 116 sent sees through colored filter 134 and forms colored points, and constitutes coloured image.Below be the character of display floater of enumerating the Organic Light Emitting Diode of several groups of experimental results explanation present embodiments. in the ensuing again experiment, the luminescent layer material comprises host emitter MADN, the mix 8% the first guest emitter Perylene and the 0.1% the second guest emitter DCJTB. and collocation ITO is anode, NPB is an electric hole transport layer, Alq is an electron transfer layer, LiF/Al is the display floater of the Organic Light Emitting Diode of composite cathode formation, carries out following experiment.
Related experiment
Experiment one-illumination
Negative electrode and anode are passed to electric current, and measurement luminosity. Fig. 2 illustrates the graph of a relation according to the luminous efficiency and the current density of preferred embodiment of the present invention. as seen from the figure, the luminous efficiency of the luminescent layer of present embodiment can reach 7.9cd/A, shows its high efficiency opto-electronic conversion usefulness.
Experiment two-colourity
Negative electrode and anode are passed to electric current, and measure chromaticity coordinate value CIE with color analysis instrument
X, CIE
Y, and the relation of driving voltage and chromaticity coordinate value of illustrating is as follows. Fig. 3 A illustrates the driving voltage and the chromaticity coordinate value (CIE of preferred embodiment of the present invention
X) graph of a relation, Fig. 3 B illustrates the driving voltage and the chromaticity coordinate value (CIE of preferred embodiment of the present invention
Y) graph of a relation.Following at same driving voltage is with CIE
XAnd CIE
YChromaticity coordinate figure comparison with Commission Internationale De L'Eclairage.By the result as can be known, the luminescent layer material of present embodiment can obtain pure white photochromic.
The test of experiment three-stability
The display floater of Organic Light Emitting Diode applies fixed voltage continuously, measures its brightness in different time points.Original intensity 3000nits for being set at 100%, and is calculated its relative brightness respectively.By the growth of comparing along with the operating time, the intensity of variation of the relative brightness of Organic Light Emitting Diode is in order to the stability of the display floater of inquiring into Organic Light Emitting Diode. and Fig. 4 illustrates according to the relative brightness of preferred embodiment of the present invention and the graph of a relation of operating time.After lasting 333 hours of operating time, oled luminance still can keep 70%.Hence one can see that, and the stability of the luminescent layer material of present embodiment is good, gives Organic Light Emitting Diode extremely long useful life.
The disclosed luminescent layer of the above embodiment of the present invention and be applied to the display floater of Organic Light Emitting Diode, the individual layer luminous layer structure that it adopts a kind of host emitter and a kind of guest emitter material mixing to form, the guest emitter system of blue light to the host emitter of blue green light and ruddiness to gold-tinted mixes with special ratios, in order to send pure white coloured light. moreover, luminescent layer material of the present invention more comprises another guest emitter, its light emitting region is between the blue green light scope between blue light, in order to the reinforcement blue light, strengthen pure white coloured light and improve luminous efficiency. in addition, the stability of the luminescent layer material of present embodiment is good, gives Organic Light Emitting Diode extremely long useful life.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (9)
1. the luminescent layer of an Organic Light Emitting Diode, the material of this luminescent layer comprises:
One host emitter, its emission wavelength are between 300 nanometer to 530 nanometers, and this main light emission system comprises MADN;
One first guest emitter, its emission wavelength are between 300 nanometer to 530 nanometers, and this first guest emitter system comprises Perylene; And
One second guest emitter, its emission wavelength are between 530 nanometer to 720 nanometers, and this second guest emitter system comprises DCJTB.
2. luminescent layer according to claim 1 is characterized in that, the doping volume ratio of this first guest emitter is between 0.01% to 50%.
3. luminescent layer according to claim 2 is characterized in that, the doping volume ratio of this first guest emitter is between 0.1% to 50%.
4. luminescent layer according to claim 2 is characterized in that, the doping volume ratio of this second guest emitter is between 0.01% to 5%.
5. luminescent layer according to claim 4 is characterized in that, the doping volume ratio of this second guest emitter is between 0.1% to 5%.
6. luminescent layer according to claim 1 is characterized in that, the doping volume ratio of this second guest emitter is between 0.01% to 5%.
7. luminescent layer according to claim 6 is characterized in that, the doping volume ratio of this second guest emitter is between 0.1% to 5%.
8. luminescent layer according to claim 1 is characterized in that, the molecular weight of this first guest emitter and this second guest emitter is less than 1000.
9. luminescent layer according to claim 1 is characterized in that, the molecular weight of this host emitter, this first guest emitter or this second guest emitter is less than 1000.
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| CN100421278C true CN100421278C (en) | 2008-09-24 |
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| CN1543659A (en) * | 2001-05-16 | 2004-11-03 | ����˹�ٴ�ѧ���»� | High efficiency multi-color electro-phosphorescent OLEDs |
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