JP2532607Y2 - Electroluminescent lamp - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroluminescent lamp, and more particularly, to an organic electroluminescent lamp used for a backlight of a liquid crystal display device.

2. Description of the Related Art As shown in the sectional views of FIGS. 3 and 4, an organic electroluminescent lamp used for a backlight or the like of a liquid crystal display device includes a back electrode 1 made of aluminum foil or the like and an organic binder in order from the bottom. Reflective insulating layer 2 in which barium titanate or the like is dispersed
A light emitting layer 4 in which a phosphor 3 such as zinc sulfide activated with copper is dispersed in an organic binder, a transparent electrode 5 such as ITO, and a transparent plastic sheet 6 as a base material of the transparent electrode 5 are laminated. In FIG. 3, reference numerals 7 and 8 denote moisture-absorbing films such as nylon (trade name of Nippon, hereinafter referred to as nylon), and reference numerals 9 and 10 denote moisture-proof outer skin films such as fluororesin.

Problems to be Solved by the Invention By the way, in the above-mentioned conventional electrode light emitting lamp, as shown in FIG. 4, a reflective insulating layer 2 is applied on a back electrode 1 and dried, and then a light emitting layer 4 is applied. When the light emitting layer 4 is dried at high humidity, the organic binder in the reflective insulating layer 2 dissolves, so that the phosphor 3 in the light emitting layer 4 sinks into the reflective insulating layer 2 and is laminated. Has the drawback that the smoothness of the phosphor decreases and the light extraction effect at the time of phosphor emission decreases.

Means for Solving the Problems In order to solve the above problems, the present invention is arranged between a transparent electrode and a rear surface back electrode, an organic binder layer sandwiched between a light emitting layer and a reflective insulating layer, and, The electroluminescent lamp is characterized in that the light emitting layer, the organic binder layer, and the reflective insulating layer are laminated by respective coatings.

Action According to the above configuration, since there is a binder layer between the reflective insulating layer and the light emitting layer, the phosphor sinks into the reflective insulating layer,
Since the reflective insulating layer is absorbed by the binder layer, the smoothness of the reflective insulating layer is maintained, and an increase in luminance accompanying an improvement in reflectance can be realized.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an electroluminescent device 11 according to the present invention.
The electroluminescent device 11 having such a structure is manufactured as follows. After a reflective insulating layer 2 in which barium titanate or the like is dispersed in an organic binder is applied on an aluminum foil 1 serving as a back electrode, a binder layer 12 such as cyanoethyl pullulan is applied, and a light emitting layer 4 in which a phosphor 3 is dispersed is formed. It is applied and a transparent electrode 5 is provided thereon to form an electroluminescent element.

 Next, the operating characteristics of the electroluminescent lamp according to the present invention will be described.

FIG. 2 shows the luminance-voltage characteristics of the electroluminescent lamp according to the present invention. In the electroluminescent lamp according to the present invention, since the immersion of the phosphor 3 is absorbed by the binder layer 12, the smoothness of the reflective insulating layer is maintained, and the reflectance is increased by about 5% as compared with the conventional product. To increase.

In the above embodiment, cyanoethyl pullulan was used for the binder layer. However, cyanoethyl-based binders such as cyanoethyl saccharose and sifnoethyl cellulose were also effective.

Effect of the Invention As described above, according to the present invention, by providing the binder layer, the penetration of the phosphor is absorbed by the binder layer, thereby improving the reflectance of the reflective insulating layer and increasing the luminance. There is.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of an electroluminescent device according to the present invention, and FIG. 2 shows luminance-voltage characteristics of the electroluminescent lamp of the present invention and a conventional example. FIG. 3 is a cross-sectional view of a conventional electroluminescent lamp, and FIG. 4 is an enlarged cross-sectional view of a main part of the conventional electroluminescent element. 1 ... back electrode, 2 ... reflective insulating layer, 3 ... phosphor, 4
… Emitting layer, 12… Binder layer.

Claims (1)

(57) [Scope of request for utility model registration] An organic binder layer sandwiched between a light emitting layer and a reflective insulating layer is provided between a transparent electrode and a back electrode, and the light emitting layer, the organic binder layer, and the reflective insulating layer are provided. An electroluminescent lamp in which layers are laminated by respective coatings.