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Organic electroluminescence cell, planar light source and display device

A luminescent and organic technology, applied in the field of organic electroluminescent units, can solve problems such as high luminous efficiency

Inactive Publication Date: 2004-06-09
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] A scheme has never been proposed to produce the maximum luminous efficiency, for example through the combination of an organic electroluminescent cell and a reflective circularly polarizing element, assuming that the interference of the light guiding in the organic electroluminescent cell with the distance between the light-emitting area and the reflective electrode The relationship between the effects of the

Method used

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  • Organic electroluminescence cell, planar light source and display device
  • Organic electroluminescence cell, planar light source and display device
  • Organic electroluminescence cell, planar light source and display device

Examples

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Embodiment 1

[0202] The present invention is specifically described in the following Examples 1-1 to 1-6 and Comparative Examples 1-1 to 1-6, in which a light-diffusing layer (light-diffusing adhesive) or The lens structure acts as a reflection / refraction disrupting area.

Embodiment 1-1

[0204]

[0205] ITO ceramic targets (In 2 o 3 : SiO 2 =90% by weight: 10% by weight) to form a 100 nm-thick ITO film to form a transparent electrode (anode).

[0206] Then, under the condition of using a photoresist, the ITO was etched to form a pattern with a light emitting area of ​​15×15 mm. After ultrasonic cleaning, ozone cleaning is performed using a low-pressure UV lamp.

[0207] Organic layers were then successively formed on the ITO surface by vacuum vapor deposition. First, CuPc represented by formula (3) was deposited at a vapor deposition rate of 0.3nm / s to form a 15nm thick hole injection layer, and then CuPc represented by formula (4) was deposited at a vapor deposition rate of 0.3nm / s α-NPD to form a 40 nm thick hole transport layer. Finally, Alq represented by formula (5) was deposited at a vapor deposition rate of 0.3 nm / s to form a 140 nm-thick electron transport light-emitting layer.

[0208] Then, Mg and Ag were co-deposited at a vapor deposition ra...

Embodiment 1-2

[0223] An organic EL unit as a basic structure and an organic EL unit including a light-diffusing layer added to the basic structure were produced in the same manner as in Example 1-1, but an Alq layer represented by formula (5) was formed with a thickness of 120 nm As an electron transport light-emitting layer.

[0224] Before and after forming the light-diffusing layer, a voltage of 13.1 V was applied to the organic EL cell so that the current density was 10.5 mA / cm 2 An electric current flows in the cell to generate light in the same way. Under this condition, the organic EL unit was evaluated in the same manner as in Example 1-1. The evaluation results are shown in Table 1-2. Incidentally, the luminance distribution in the θ direction before forming the light-diffusing layer satisfies the relationship given by the expression (1) of the present invention, and the value of 120 nm as the thickness of the Alq layer also satisfies the relationship given by the expression (2) ...

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Abstract

An organic electroluminescence cell including at least one organic layer and a pair of electrodes, the organic layer including a light-emitting layer and sandwiched between the pair of electrodes, the pair of electrodes including a reflective electrode and a transparent electrode, the organic electroluminescence cell formed to satisfy the expression; Btheta in which B0 is a frontal luminance value of luminescence radiated from a light extraction surface to an observer, and Btheta is a luminance value of the luminescence at an angle of from 50 DEG to 70 DEG , wherein a reflection / refraction angle disturbance region is provided so that the angle of reflection / refraction of the luminescence is disturbed while the luminescence is output from the light-emitting layer to the observer side through the transparent electrode.

Description

[0001] This application is based on Japanese Patent Application Nos. 2002-341821, 2003-000080, 2003-062554 and 2003-280576, which are incorporated herein by reference. technical field [0002] The present invention relates to an organic electroluminescence unit, which has excellent luminous efficiency, especially the efficiency of extracting light out, relates to a high-efficiency (polarized) planar light source using the organic electroluminescence unit, and a planar light source with the planar light source (liquid crystal) display device. Background technique [0003] An electroluminescent cell or a light emitting diode in which a light emitting layer is provided between electrodes to obtain electroluminescence has been actively researched and developed not only for use in display devices but also for use in various light sources such as planar light emitters , Optical fiber light source, backlight unit for liquid crystal displa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02G02F1/13357H05B33/02H05B33/22H10K99/00
CPCH01L51/005H01L51/0078H01L51/0059H01L51/0037H01L51/0062H01L51/007H01L51/0041H01L2251/558H01L51/0081H01L51/0052H01L51/0042H01L51/5262H10K85/143H10K85/146H10K85/1135H10K85/60H10K85/649H10K85/615H10K85/6565H10K85/631H10K85/311H10K85/324H10K2102/351H10K59/878H05B33/22H10K50/85
Inventor 中村年孝宫武稔中野秀作
Owner NITTO DENKO CORP
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