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CdS organic electroluminescence device

An electroluminescent device and a technology for light-emitting devices, which are applied to the field of light-emitting devices in the field of white light illumination, can solve the problems of decreased device efficiency, low device efficiency, concentration quenching, etc., and achieve the effects of improving brightness and efficiency.

Inactive Publication Date: 2014-07-09
JILIN NORMAL UNIV
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Problems solved by technology

(1) There are few organic materials that emit phosphorescence at room temperature, (2) Because the lifetime of phosphorescence is generally very long (on the order of 10-6s), the lifetime of fluorescence is generally very short ( 10-9s level), so when the phosphorescent material is mixed into the fluorescent material matrix, if the doping concentration is low, it will cause the phosphorescent emission point to be already Saturation (saturation of emission sites), the device efficiency is 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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  • CdS organic electroluminescence 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, characterized in that: it also includes a CdS electron injection layer (0.1nm), the CdS electron injection layer is arranged between the Alq3 layer and the 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 c...

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Abstract

The invention relates to a luminescent device in the field of white-light illumination, in particular to a CdS organic electroluminescence device. The CdS organic electroluminescence device comprises an ITO glass anode substrate, an NPB layer, a Rubrene layer, an NPB layer, a DPVBi layer, an Alq3 layer, a LiF layer and an Al cathode layer from bottom to top in sequence. The CdS organic electroluminescence device is characterized in that the CdS organic electroluminescence device further comprises a CdS electron injection layer, and the CdS electron injection layer is arranged between the Alq3 layer and the LiF layer. The CdS organic electroluminescence device improves injection of electrons, improves balance of carriers, improves the forming rate of excition, and therefore the efficiency a white organic electroluminescence device is improved.

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: life expectancy is 20 times that of ordinary light bulbs; energy loss is low; high-quality light output, ultraviolet (UV) and infrared (IR) radiation is small; driving voltage is low, with better 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 ...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54
CPCH10K50/171
Inventor 姜文龙汪津丁桂英薛志超
Owner JILIN NORMAL UNIV
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