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A cds organic electroluminescent device

A technology of electroluminescent devices and light-emitting devices, applied in the field of light-emitting devices in the field of white light lighting, can solve the problems of device efficiency decline, low device efficiency, concentration quenching, etc., and achieve the effect of improving brightness and efficiency

Inactive Publication Date: 2016-07-20
JILIN NORMAL UNIV
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Problems solved by technology

(1) There are few organic materials that emit phosphorescence at room temperature, (2) Due to the long lifetime of phosphorescence (10 -6 s level), the fluorescence lifetime is generally very short (10 -9 s level), so that when the phosphorescent material is mixed into the fluorescent material matrix, if the doping concentration is low, the phosphorescent emission sites will be saturated when the injected current is very small, and the device efficiency will be very low; If the concentration of incorporation is too large, concentration quenching occurs due to the interaction between triplet excitons
Even if the concentration of the doped phosphorescent material is optimized, when the injected current increases, the efficiency of the device will decrease with the increase of the injected current due to the saturation of the phosphorescent emission site.

Method used

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  • A cds organic electroluminescent device
  • A cds organic electroluminescent device
  • A cds organic electroluminescent device

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Embodiment Construction

[0025] attached by figure 1 Shown: The light-emitting device includes ITO glass anode substrate (70nm), NPB layer (50nm), Rubrene layer (0.2nm), NPB layer (5nm), DPVBi layer (30nm), Alq3 layer (30nm) from bottom to top , LiF layer (0.5nm) and Al cathode layer (100nm~120nm) layer, it is characterized in that: it also comprises a CdS electron injection layer (0.1nm), and described CdS electron injection layer is arranged on Alq3 layer and LiF layer between;

[0026] The preparation process is as follows: using ITO glass as the anode substrate, the ITO glass is repeatedly scrubbed with acetone, ethanol, and deionized water, ultrasonically, and finally dried; the device is prepared in a multi-source organic molecule vapor deposition system, and the materials used are respectively Placed in different evaporation sources, the temperature of each evaporation source can be controlled separately, and the evaporation of NPB layer, Rubrene layer, NPB layer, DPVBi layer and Alq3 layer is...

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Abstract

The invention relates to a light-emitting device in the field of white light lighting, in particular to a cadmium sulfide (CdS) organic electroluminescent device. The light-emitting device comprises an ITO glass anode substrate, an NPB layer, a Rubrene layer, and an NPB Layer, DPVBi layer, Alq3 layer, LiF layer and Al cathode layer, it is characterized in that: it also comprises a CdS electron injection layer, and described CdS electron injection layer is arranged between Alq3 layer and LiF layer; Device of the present invention improves electron The injection can improve the balance of carriers and increase the rate of exciton formation, thereby improving the efficiency of white organic electroluminescent devices.

Description

technical field [0001] The invention relates to a light-emitting device in the field of white light illumination, in particular to a cadmium sulfide (CdS) organic electroluminescent device. Background technique [0002] White organic electroluminescent device (WOLED) can be used not only as a backlight for flat panel display, but also as white lighting. It competes with mature and cheap lighting products such as incandescent bulbs, and has become a new hot spot in the field of OLED. This is mainly because WOLED has the following advantages: the lifespan is 20 times that of ordinary bulb light sources; the energy loss is low; the high-quality light output has very little ultraviolet (UV) and infrared (IR) radiation; safety of use. [0003] Nowadays, organic electroluminescent devices (OLEDs) have entered the stage of industrialization, but there are still problems such as low yield, high market price, and unsatisfactory performance stability. Optimization of device structur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/54
CPCH10K50/171
Inventor 姜文龙高永慧汪津丁桂英薛志超
Owner JILIN NORMAL UNIV
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