JPH03105896A - El device - Google Patents

Abstract

PURPOSE:To raise electron injection efficiency and lower alteration as time being by inducing an electron and a hole to recombination luminescent a center so as to emit light. CONSTITUTION:Conductive polyacetylene molecule is bound to each of right and left sides of perillene electroluminescent center and + and - dopants are doped in the polyacetylene so as to form an electron trap and a hole trap respectively. A number of electroluminescent bodies are arranged vertically and the upper ends and the lower ends are respectively bound with conductive films and the electroluminescent bodies further reacted with conductive polyacetylene as electrodes are function of each body is combined in a huge molecule by laminating those molecules. In this way, resistance due to work function in interfaces of materials is eliminated and light emitting efficiency is highened and alteration as time being is lowered because of low heat generation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of an EL light emitter. [Prior Art] Conventionally, Japanese Journal of Applied Physics VOL. 27. No. 2 (1988)
PPL269-L261 (J.J.A.P.νOL.2
7. No.2. (1988) PPL269-L261
Electrolum; nescenca in O
rganic Fil+++swith Three-
Layer Structure; C. Adach
As discussed in etal), a structure was adopted in which three layers of different organic materials were laminated separately. As shown in Figure 2, this means that the emissive layer (berylene, etc.) is combined with the electron injection layer (
pv) and a hole injection layer (TPD). By applying a voltage between the upper and lower electrodes, electrons and holes injected from each into the light emitting layer recombine, producing light emission.

[Problem to be solved by the invention]

The above-mentioned conventional technology has a problem in that the electron/hole injection layer changes over time and ceases to function.

Furthermore, the luminous efficiency was low because the work function and injection efficiency between the electron/hole injection layer and the luminescent layer were insufficient.

The purpose of the present invention is to provide a light emitting material that increases electron injection efficiency and exhibits less change over time. [Means for solving the problem] In order to achieve the above object, an electron trap, a hole trap, and a recombination luminescent center are provided on one molecule, and by applying an electric field, electrons and holes are generated at the recombination luminescent center. It uses luminescent materials that recombine to produce light. [Operation] Electrons and holes are transported by an electric field on molecules with high conductivity, recombine at recombination centers, and emit light. On this occasion,
Unlike the conventional stacked structure shown in Figure 2, the electron injection part and hole injection part are not stacked separately from the light emission part, so electrons and holes are quickly guided to the emission center. Unlike conventional products, there is no interfacial resistance, and as a result, heat generation is also small, so material changes over time are small. [Example] Hereinafter, an example of the present invention will be explained with reference to FIGS. 1 and 3. Figure 1 shows an electron trapping region formed by bonding conductive polyacetylene molecules to the left and right sides of berylene, the luminescent center, respectively, and adding dopants of ■ and O to it.
This is where a hole trap part is formed. In Figure 3, the light emitters in Figure 1 are arranged vertically and their upper and lower ends are tied together with a conductive film. This is Langmuir
It is obtained by further reacting the luminescent bodies shown in Figure 1, which have been aligned using the Projet method, with conductive polyacetylene as an electrode. Functions that were conventionally performed in separate parts through lamination are integrated into a giant molecule, and because there is no voltage resistance derived from the work function of the interface between materials, light emission is highly efficient. It also generates less heat and changes little over time.

〔Effect of the invention〕

According to the present invention, there is an effect of increasing the efficiency of light emission and extending the life span.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the chemical structure of an embodiment of the present invention, Fig. 2 is a cross-sectional diagram of a conventional organic EL element, and Fig. 3 is an explanatory diagram of the molecular structure in the cross-sectional direction of an embodiment of the present invention. be.

Claims (1)

[Claims] 1. One molecule has electron traps, hole traps, and recombination luminescent centers in the absence of an applied electric field, and by applying an electric field to this, electrons and holes are guided to the recombining luminescent center and emit light. EL luminescent material.