JP2009295487A - Organic el lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL lighting device capable of being miniaturized. <P>SOLUTION: The organic EL lighting device 1 includes a flat organic EL element 2 and a rectifying circuit element4 arranged integrally with the organic EL element 2 and rectifying AC supplied from outside and supplying it to the organic EL element 2. The organic EL element 2 includes a substrate 11, an element part 12, a sealing material 13, and a sealing plate 14. The element part 12 includes a transparent electrode 21, an organic light emitting layer 22, and a negative electrode 23. The rectifying circuit element 4 includes a flat heat sink 32. The heat sink 32 is arranged so as to make a plane contact with a heat diffusion plate 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an organic EL (electroluminescence) illumination device including a rectifier circuit.

  The organic EL lighting device includes an organic EL element having diode characteristics. When a current flows in the forward direction, the organic EL element emits light proportional to the current value. Therefore, when the organic EL lighting device is driven by an AC power source, flashing light emission occurs in accordance with the AC cycle. Here, the period of a normal commercial power source (100 V to 220 V) of 50 Hz to 60 Hz is about 16.7 msec to about 20.0 msec. This period is very long compared to the response speed of the organic EL element which is several nsec to several tens of nsec. For this reason, even if an inverter or the like is used, the blinking of the organic EL element cannot be suppressed, which causes a problem of flickering to human eyes and giving unpleasant feeling.

Therefore, Patent Document 1 discloses an organic EL lighting device in which a rectifier circuit is connected between an AC power source and an organic EL element. In this organic EL lighting device, it was possible to suppress blinking of the organic EL element by supplying current to the organic EL element via the rectifier circuit.
JP 2005-149744 A

  However, the organic EL lighting device of Patent Document 1 has a problem that the rectifier circuit and the organic EL element are separately provided, and thus the size is increased.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an organic EL lighting device that can be reduced in size.

  In order to achieve the above-mentioned object, the invention described in claim 1 is characterized in that a planar organic EL element and the organic EL element are integrally installed on the organic EL element, and full-wave rectification is performed on the alternating current supplied from the outside. An organic EL lighting device comprising a rectifier circuit element to be supplied to an EL element.

  The invention according to claim 2 includes a planar heat diffusion plate provided on one surface of the organic EL element, wherein the rectifier circuit element and the heat diffusion plate are in contact with each other. The organic EL lighting device according to claim 1.

  The invention according to claim 3 is the organic EL lighting device according to claim 1 or 2, wherein the thermal diffusion plate and the rectifier circuit element are in surface contact.

  The invention according to claim 4 is characterized in that the rectifier circuit element has a heat radiating plate, and the heat radiating plate and the heat diffusing plate are in surface contact. 4. The organic EL lighting device according to any one of 3 above.

  The invention according to claim 5 is characterized in that the rectifier circuit element has a heat radiating plate, and the rectifier circuit element is installed so that the heat radiating plate faces outward. It is an organic electroluminescent illuminating device of any one of Claim 3.

  The invention according to claim 6 is the organic EL lighting device according to claim 1, wherein the rectifier circuit element is erected with respect to the organic EL element. .

  The invention according to claim 7 is provided with a smoothing circuit element integrally installed on the organic EL element, and the organic EL according to any one of claims 1 to 6. It is a lighting device.

  The invention according to claim 8 is characterized in that the organic EL element includes an organic light emitting layer and a metal electrode formed of a metal layer formed on one surface of the organic light emitting layer. The organic EL lighting device according to claim 1, wherein the organic EL lighting device is provided on the metal electrode side as viewed from the organic light emitting layer.

  The invention according to claim 9 is the organic EL lighting device according to any one of claims 1 to 8, wherein the thermal diffusion plate contains a metal.

  According to the present invention, downsizing can be realized by providing the rectifier circuit element integrally with the organic EL element.

  Hereinafter, a first embodiment in which the present invention is applied to a bottom emission type organic EL lighting device will be described with reference to the drawings. FIG. 1 is an overall perspective view of the organic EL lighting device according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a circuit diagram of the organic EL lighting device. In the following description, the vertical direction shown in FIG.

  As shown in FIGS. 1 and 2, the organic EL lighting device 1 according to the first embodiment includes an organic EL element 2, a thermal diffusion plate 3, a rectifier circuit element 4, and a wire 5.

  The organic EL element 2 is formed in a planar shape. The organic EL element 2 includes a substrate 11, an element part 12, a sealing material 13, and a sealing plate 14. A region surrounded by the substrate 11, the sealing material 13, and the sealing plate 14 is a sealing region 15.

  The substrate 11 is made of a glass substrate having a thickness of about 0.5 mm and capable of transmitting light. The upper surface of the substrate 11 is a growth main surface 11a on which the element portion 12 is formed. The lower surface of the substrate 11 is a light extraction surface 11b from which light is extracted.

  The element unit 12 includes a transparent electrode 21, an organic light emitting layer 22, and a cathode (corresponding to the metal electrode in the claims) 23.

  The transparent electrode 21 is made of ITO (indium tin oxide) having a thickness of about 100 nm capable of transmitting light. The transparent electrode 21 is formed on the growth main surface 11 a of the substrate 11. The transparent electrode 21 includes an anode 25 and an external terminal 26.

  The anode 25 is for injecting holes into the organic light emitting layer 22. The anode 25 is formed on the growth main surface 11 a in the sealing region 15. The anode 25 is formed integrally with a part of the external terminal 26.

  The external terminal 26 is for connecting the anode 25 and the cathode 23 to the AC external power supply 9 (see FIG. 3) via the power supply terminal 6. The external terminal 26 is formed on the growth main surface 11 a outside the sealing region 15. The external terminal 26 is patterned and divided into a plurality of regions.

The organic light emitting layer 22 is for emitting light. The organic light emitting layer 22 is formed on the anode 25 in an electrically connected state. The organic light emitting layer 22 is formed in the sealing region 15. In the organic light emitting layer 22, a hole transport layer and an electron transport layer are sequentially stacked from the anode 25 side. The hole transport layer is made of an NPD (diphenylnaphthyldiamine) film having a thickness of about 50 nm. The electron transport layer is made of a quinolinol aluminum complex (Alq ₃ ) film having a thickness of about 50 nm and mixed with a dye. Further, copper phthalocyanine (CuPc) may be laminated between the anode 25 and the organic light emitting layer 22 in order to promote hole injection from the anode 25.

  The cathode 23 is for injecting electrons into the organic light emitting layer 22. The cathode 23 is formed on the organic light emitting layer 22 in an electrically connected state. The cathode 23 is made of an Al film having a thickness of about 100 nm. The cathode 23 is insulated from the anode 25 by an insulating film (not shown). One end of the cathode 23 is connected to the external terminal 26.

  The sealing material 13 is for sealing the substrate 11 and the sealing plate 14 together. The sealing material 13 is made of an insulating UV curable resin. The sealing material 13 is formed so as to surround the outside of the organic light emitting layer 22.

  The sealing plate 14 is made of a glass substrate having a thickness of about 0.5 mm. The sealing plate 14 is formed in a rectangular shape smaller than the substrate 11.

  The heat diffusing plate 3 is for diffusing the heat generated by the organic EL element 2 and the rectifying circuit element 4 to suppress local high heat. The heat diffusion plate 3 is made of a planar Al plate having a thickness of about 1 mm. In addition, you may comprise the thermal-diffusion board 3 by the metal layer which carried out Cu layer or anodized. The heat diffusing plate 3 is bonded to the entire upper surface of the sealing plate 14 which is one surface of the organic EL element 2 via a heat conductive sheet (not shown). That is, the heat diffusing plate 3 is provided on the cathode 23 side when viewed from the organic light emitting layer 22.

  The rectifier circuit element 4 is for full-wave rectification of the alternating current supplied from the external power supply 9 and supplies it to the organic EL element 2. As shown in FIG. 3, the rectifier circuit element 4 is a single-phase bridge rectifier type having four diodes. The rectifier circuit element 4 is bonded to the vicinity of one side of the heat diffusion plate 3 on the external terminal 26 side. The rectifier circuit element 4 includes a main body portion 31, a heat radiating plate 32, and four terminals 33. The main body 31 includes the four diodes described above. The heat radiating plate 32 is installed on the lower surface of the main body 31. The rectifier circuit element 4 is installed such that the heat radiating plate 32 is in surface contact with the heat diffusing plate 3. Each terminal 33 protrudes from one side of the heat diffusing plate 3 to above the external terminal 26. Each terminal 33 is connected to the external terminal 26 by a wire 5.

  Next, the operation of the organic EL lighting device 1 according to the first embodiment will be described with reference to the drawings. FIG. 4 is a graph showing the relationship between AC voltage and time supplied from an external power source. FIG. 5 is a graph showing the voltage-time relationship of the pulsating current rectified by the rectifying circuit element.

  First, in the organic EL lighting device 1, the alternating current shown in FIG. This alternating current is full-wave rectified by the rectifier circuit element 4 as shown in FIG. Thereafter, holes are injected into the organic light emitting layer 22 through the anode 25 by the full-wave rectified current. Further, electrons are injected into the organic light emitting layer 22 through the cathode 23 by the full-wave rectified current. The injected holes and electrons recombine in the organic light emitting layer 22 to emit light. The light is transmitted to the outside through the anode 25 and the substrate 11.

  Here, in the organic EL lighting device 1, the alternating current shown in FIG. 4 is full-wave rectified by the rectifier circuit element 4 as shown in FIG. For this reason, the blinking cycle of the organic EL lighting device 1 is ½ of the supplied alternating cycle. As a result, the flicker of the organic EL lighting device 1 is reduced.

  Next, the manufacturing process of the organic EL lighting device 1 according to the first embodiment will be described. 6-12 is sectional drawing of the organic electroluminescent illuminating device in each manufacturing process.

  First, as shown in FIG. 6, a transparent electrode 21 made of an ITO film is formed on the entire growth main surface 11 a of the substrate 11.

  Next, as shown in FIG. 7, a resist film 41 is formed in a predetermined region by using a photolithography technique. Thereafter, the transparent electrode 21 in the region exposed from the resist film 41 is etched. Thereby, the transparent electrode 21 including the anode 25 and the external terminal 26 is patterned.

  Next, as shown in FIG. 8, the hole transport layer and the electron transport layer of the organic light emitting layer 22 are sequentially deposited in a desired region on the anode 25 using the shadow mask 42 in which the opening 42 a is formed.

  Next, as shown in FIG. 9, the cathode 23 made of an Al film is vapor-deposited in desired regions on the organic light emitting layer 22 and the transparent electrode 21 using the shadow mask 43 in which the opening 43 a is formed.

  Next, as shown in FIG. 10, a sealing material 13 made of a UV curable resin is applied so as to surround the outer periphery of the organic light emitting layer 22. Thereafter, the sealing plate 14 is placed on the sealing material 13. In this state, UV (ultraviolet rays) is irradiated to cure the sealing material 13.

  Next, as shown in FIG. 11, the heat diffusing plate 3 is attached via a heat conductive sheet so as to coincide with the upper surface of the sealing plate 14.

  Next, as shown in FIG. 12, the rectifier circuit element 4 is bonded to a predetermined region of the heat diffusion plate 3. Thereafter, the terminal 33 of the rectifier circuit element 4 is connected to the external terminal 26 by the wire 5.

  Thereby, the organic EL lighting device 1 shown in FIGS. 1 and 2 is completed.

  As described above, in the organic EL lighting device 1 according to the first embodiment, the rectifier circuit element 4 is provided integrally with the organic EL element 2. Thereby, size reduction of the organic EL lighting device 1 can be realized.

  In the organic EL lighting device 1, the rectifier circuit element 4 is bonded on the heat diffusion plate 3 made of an Al plate having high thermal conductivity and heat dissipation. Thereby, even if the rectifier circuit element 4 generates heat during light emission, heat can be conducted and diffused by the heat diffusion plate 3 in the plane. For this reason, since it can suppress that it becomes high heat locally, it can suppress that the electric current value of the organic light emitting layer 22 in a surface biases. As a result, in-plane luminance deviation can be suppressed.

  In the organic EL lighting device 1, the heat diffusion plate 3 and the heat radiating plate 32 of the rectifier circuit element 4 are bonded so as to be in surface contact. Thereby, the heat dissipation of the rectifier circuit element 4 can be improved more.

  Further, in the organic EL lighting device 1, the thermal diffusion plate 3 is provided on the cathode 23 side made of an Al film as viewed from the organic light emitting layer 22. Thus, by providing the thermal diffusion plate 3 on the side of the cathode 23 having high thermal conductivity, the heat dissipation can be further improved.

(Second Embodiment)
Next, an organic EL lighting device according to a second embodiment in which the first embodiment described above is partially modified will be described. FIG. 13 is an overall perspective view of the organic EL lighting device according to the second embodiment. FIG. 14 is a circuit diagram of the organic EL lighting device. In addition, the same code | symbol is attached | subjected to the structure same as the structure of 1st Embodiment, and description is abbreviate | omitted.

  As shown in FIGS. 13 and 14, the organic EL lighting device 1 </ b> A according to the second embodiment includes a smoothing circuit element 7.

  The smoothing circuit element 7 is for smoothing the pulsating flow rectified by the rectifying circuit element 4. The smoothing circuit element 7 is integrally installed on the substrate 11. As shown in FIG. 14, the smoothing circuit element 7 has an electric field capacitor and a choke coil.

  Since the organic EL lighting device 1 </ b> A according to the second embodiment includes the smoothing circuit element 7, the pulsating flow rectified by the rectifying circuit element 4 can be smoothed. As a result, the current supplied to the organic EL element 2 becomes a direct current greater than or equal to a substantially threshold value. For this reason, since the time when the organic EL element 2 is turned off is shortened, flickering due to blinking can be further suppressed.

  Moreover, in the organic EL lighting device 1A, since the smoothing circuit element 7 is integrally provided on the substrate 11 of the organic EL element 2, the above-described effects can be achieved while suppressing an increase in the size of the organic EL lighting device 1A. it can.

(Third embodiment)
Next, an organic EL lighting device according to a third embodiment in which the above-described embodiment is partially changed will be described. FIG. 15 is an overall perspective view of the organic EL lighting device according to the third embodiment. In addition, the same code | symbol is attached | subjected to the structure same as the structure of embodiment mentioned above, and description is abbreviate | omitted.

  As shown in FIG. 15, in the organic EL lighting device 1 </ b> B according to the third embodiment, the rectifier circuit element 4 is erected with respect to the organic EL element 2. Here, the heat radiating plate 32 of the rectifying circuit element 4 is installed so as to contact the side surface of the heat diffusing plate 3. Note that a wire connecting the terminal 33 of the rectifier circuit element 4 and the external terminal 26 is omitted.

  By erecting the rectifier circuit element 4 in this way, it is possible to suppress the heat of the rectifier circuit element 4 from being transmitted to the organic EL element 2. Moreover, since the slight heat transmitted to the organic EL element 2 is also diffused by the heat diffusion plate 3, it is possible to suppress the unevenness of luminance.

(Fourth embodiment)
Next, an organic EL lighting device according to a fourth embodiment in which the above-described embodiment is partially changed will be described. FIG. 16 is an overall perspective view of the organic EL lighting device according to the fourth embodiment. In addition, the same code | symbol is attached | subjected to the structure same as the structure of embodiment mentioned above, and description is abbreviate | omitted.

  As shown in FIG. 16, in the organic EL lighting device 1 </ b> C according to the fourth embodiment, the main body 31 of the rectifier circuit element 4 is bonded to the heat diffusing plate 3. That is, the heat sink 32 of the rectifier circuit element 4 is installed so as to face outward. Thereby, the heat dissipation of the rectifier circuit element 4 can be improved more. Note that a wire connecting the terminal 33 of the rectifier circuit element 4 and the external terminal 26 is omitted.

(Fifth embodiment)
Next, an organic EL lighting device according to a fifth embodiment in which the above-described embodiment is partially changed will be described. FIG. 17 is an overall perspective view of the organic EL lighting device according to the fifth embodiment. In addition, the same code | symbol is attached | subjected to the structure same as the structure of embodiment mentioned above, and description is abbreviate | omitted.

  As shown in FIG. 17, in the organic EL lighting device 1 </ b> D according to the fifth embodiment, the thermal diffusion plate 3 is provided on the lower surface of the substrate 11. Further, the rectifier circuit element 4 is bonded to the heat diffusion plate 3 provided on the lower surface of the substrate 11. The configuration of the fifth embodiment is effective for a top emission type organic EL lighting device that extracts light from the sealing plate 14 side. Note that a wire connecting the terminal 33 of the rectifier circuit element 4 and the external terminal 26 is omitted.

(Sixth embodiment)
Next, an organic EL lighting device according to a sixth embodiment in which the above-described embodiment is partially changed will be described. FIG. 18 is an overall perspective view of the organic EL lighting device according to the sixth embodiment. In addition, the same code | symbol is attached | subjected to the structure same as the structure of embodiment mentioned above, and description is abbreviate | omitted.

  As shown in FIG. 18, in the organic EL lighting device 1E according to the sixth embodiment, the rectifier circuit element 4 is installed in a region exposed to the outside on the upper surface of the substrate 11 of the organic EL element 2. As described above, the organic EL lighting device 1E can be downsized by integrally installing the rectifier circuit element 4 on the organic EL element 2. Note that a wire connecting the terminal 33 of the rectifier circuit element 4 and the external terminal 26 is omitted.

  As mentioned above, although this invention was demonstrated in detail using embodiment, this invention is not limited to embodiment described in this specification. The scope of the present invention is determined by the description of the claims and the scope equivalent to the description of the claims. Hereinafter, modified embodiments in which the above-described embodiment is partially modified will be described.

  The shape, numerical value, and material of each component in the above-described embodiment can be changed as appropriate.

  For example, the circuit configuration of the rectifier circuit element can be changed as appropriate, but an element structure with one chip is preferable. This is because the organic EL lighting device can be reduced in size, weight, and thickness.

  In all the embodiments, the smoothing circuit element may be added or omitted. Further, the coil of the smoothing circuit element may be omitted.

1 is an overall perspective view of an organic EL lighting device according to a first embodiment. It is sectional drawing along the II-II line in FIG. It is a circuit diagram of an organic EL lighting device. It is a graph which shows the voltage-time relationship of the alternating current supplied from an external power supply. It is a graph which shows the voltage-time relationship of the pulsating flow rectified by the rectifier circuit element. It is sectional drawing of the organic electroluminescent illuminating device in a manufacturing process. It is sectional drawing of the organic electroluminescent illuminating device in a manufacturing process. It is sectional drawing of the organic electroluminescent illuminating device in a manufacturing process. It is sectional drawing of the organic electroluminescent illuminating device in a manufacturing process. It is sectional drawing of the organic electroluminescent illuminating device in a manufacturing process. It is sectional drawing of the organic electroluminescent illuminating device in a manufacturing process. It is sectional drawing of the organic electroluminescent illuminating device in a manufacturing process. It is a whole perspective view of the organic electroluminescent illuminating device by 2nd Embodiment. It is a circuit diagram of an organic EL lighting device. It is a whole perspective view of the organic electroluminescent illuminating device by 3rd Embodiment. It is a whole perspective view of the organic electroluminescent illuminating device by 4th Embodiment. It is a whole perspective view of the organic electroluminescent illuminating device by 5th Embodiment. It is a whole perspective view of the organic electroluminescent illuminating device by 6th Embodiment.

Explanation of symbols

1, 1A, 1B, 1C, 1D, 1E Organic EL lighting device 2 Organic EL element 3 Thermal diffusion plate 4 Rectifier circuit element 5 Wire 6 Power supply terminal 7 Smoothing circuit element 9 External power supply 11 Substrate 11a Growth main surface 11b Light extraction surface 12 Element portion 13 Sealing material 14 Sealing plate 15 Sealing region 21 Transparent electrode 22 Organic light emitting layer 23 Cathode 25 Anode 26 External terminal 31 Main body portion 32 Heat radiation plate 33 Terminal

Claims (9)

A planar organic EL element;
An organic EL lighting device comprising: a rectifier circuit element that is integrally installed in the organic EL element and that rectifies a full-wave AC supplied from the outside and supplies the rectified circuit element to the organic EL element. A planar heat diffusion plate provided on one surface of the organic EL element;
The organic EL lighting device according to claim 1, wherein the rectifier circuit element and the thermal diffusion plate are in contact with each other.   The organic EL lighting device according to claim 1, wherein the thermal diffusion plate and the rectifier circuit element are in surface contact. The rectifier circuit element has a heat sink,
The organic EL lighting device according to claim 1, wherein the heat radiating plate and the heat diffusing plate are in surface contact. The rectifier circuit element has a heat sink,
The organic EL lighting device according to any one of claims 1 to 3, wherein the rectifier circuit element is installed such that the heat radiating plate faces outward.   The organic EL lighting device according to claim 1, wherein the rectifier circuit element is erected with respect to the organic EL element.   The organic EL lighting device according to any one of claims 1 to 6, further comprising a smoothing circuit element integrally installed on the organic EL element. The organic EL element has an organic light emitting layer and a metal electrode made of a metal layer formed on one surface of the organic light emitting layer,
The organic EL lighting device according to claim 1, wherein the heat diffusion plate is provided on the metal electrode side as viewed from the organic light emitting layer.   The organic EL lighting device according to claim 1, wherein the heat diffusion plate includes a metal.

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