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Organic electric field luminous element and organic electric field luminescent display using the same

A technology of organic electric field and light-emitting elements, applied in the direction of electrical components, electric solid devices, circuits, etc., can solve the problems of chromaticity change, light extraction efficiency less than 20%, and insufficient suppression effect of chromaticity change of light extraction efficiency, etc. Achieves effects of suppressing chromaticity change and excellent light extraction efficiency

Active Publication Date: 2011-09-28
UDC IRELAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the emitted light tends to be totally reflected at the interface, and the light extraction efficiency may be less than 20%, thus losing most of the light.
[0010] However, since the above-mentioned organic electroluminescent element realizes white by using complementary colors, for example, when a color selection mechanism using a color filter is used in combination, there will be a change in chromaticity corresponding to the position of the observer relative to the organic electroluminescent element. The problem
[0011] As mentioned above, for the organic electroluminescent element having a microcavity structure, the reality is that the improvement of the light extraction efficiency and the suppression effect of the chromaticity change are still insufficient, and further improvement is desired.

Method used

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  • Organic electric field luminous element and organic electric field luminescent display using the same
  • Organic electric field luminous element and organic electric field luminescent display using the same
  • Organic electric field luminous element and organic electric field luminescent display using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0181]

[0182] On a glass substrate with a thickness of 0.7mm and a refractive index of 1.51, as a light-transmitting layer, MgF was vacuum-evaporated to a thickness of 100nm. 2 . When the refractive index of the light-transmitting layer was measured using an ellipsometer, it was 1.38.

[0183] On the light-transmitting layer, silver (Ag) was formed by vacuum deposition so as to have a thickness of 12 nm as a semi-transmitting layer.

[0184] On the semi-transmissive layer, Alq (tris(8-quinolinolato)aluminum) was formed by vacuum deposition as an intermediate layer so as to have a thickness of 130 nm. When the refractive index of Alq was measured using an ellipsometer, it was 1.74.

[0185] Then, on the intermediate layer, silver (Ag) was formed by vacuum vapor deposition as a second electrode (anode) so as to have a thickness of 20 nm, and the formed silver film was brought into contact with the electrode terminal.

[0186] On the second electrode, 2-TNATA (4,4',4"-tris...

Embodiment 2

[0193]

[0194] An organic electroluminescent element (2) was fabricated in the same manner as in Example 1 except that in Example 1, a light-transmitting layer was formed as follows.

[0195] -Formation of light-transmitting layer-

[0196] On a glass substrate with a thickness of 0.7mm and a refractive index of 1.51, MgF was vacuum-deposited so that the thickness of the light-transmitting layer would be 112nm. 2 . When the refractive index of the light-transmitting layer was measured using an ellipsometer, it was 1.38.

[0197] The obtained organic electroluminescent element (2) has a two-dimensional microcavity structure, and the produced organic electroluminescent element (2) is an element optimized for red (about 620 nm) emission.

Embodiment 3

[0199]

[0200] An organic electroluminescent element (3) was produced in the same manner as in Example 1, except that an intermediate layer was formed as follows in Example 1.

[0201] -Formation of the middle layer-

[0202] On the semi-transmissive layer, as an intermediate layer, MgF was vapor-deposited with a thickness of 30nm 2 , Next, ITO was formed by vacuum evaporation so that the thickness became 100nm. The refractive index of each was measured using an ellipsometer. As a result, MgF 2 is 1.38 and ITO is 1.98.

[0203] The obtained organic electroluminescent element (3) has a two-dimensional microcavity structure, and the produced organic electroluminescent element (3) is an element optimized for red (about 620 nm) emission.

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Abstract

The invention provides an organic electric field luminous element, comprising a first electrode, a luminous layer, a semi-transmitting second electrode, a middle layer, a semi-transmitting layer and a light-transmitting layer in order. The organic electric field luminous element also comprises a first resonator structure which resonates and ejects light ejecting from the luminescent layer between the first electrode and the second electrode, and a second resonator structure which resonates and ejects the light between the first electrode and the semi-transmitting layer. One fourth of peak value wavelength of light ejecting from the luminescent layer is set as t, and the refractive index of the light-transmitting layer is set as n. the thickness of the light-transmitting layer is set above 0.9*t / n and below 1.1*t / n.

Description

technical field [0001] The present invention relates to an organic electroluminescence element (hereinafter, sometimes referred to as "organic EL element") having a multiple resonance structure, and an organic electroluminescence display using the same. Background technique [0002] An organic electroluminescent element is a self-luminous display device, and is used for display or lighting. Compared with conventional CRTs and LCDs, organic electroluminescent displays have advantages in display performance such as high visibility and no viewing angle dependence. In addition, there is an advantage that the weight and thickness of the display can be reduced. In addition, in addition to the advantages of light weight and thin layer, organic EL lighting can also achieve lighting with shapes that have not been possible until now by using flexible substrates. [0003] As described above, the organic electroluminescent element has excellent characteristics, but in general, the ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/52H01L27/32
CPCH10K59/30H10K59/35H10K50/852
Inventor 今田有纪北村吉隆
Owner UDC IRELAND