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OLED Fundamentals

Author: IExcellenceissuing time:2017-01-04 10:42:37Pageviews:1225smallinBig

129/5000 The principle of OLED is to use ITO transparent electrode and metal electrode as the anode and cathode of the device respectively. Under certain voltage driving, electron and hole are injected from cathode and anode to electron and hole transport layer respectively. Electron and hole And the hole transport lay...
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First, OLED technology principle:

The principle of OLED is to use ITO transparent electrode and metal electrode as the anode and cathode of the device respectively. Under certain voltage driving, electron and hole are injected from cathode and anode to electron and hole transport layer respectively. Electron and hole And the hole transport layer migrate to the luminescent layer and meet in the luminescent layer to form excitons and excite the luminescent molecules which emit visible light by radiation relaxation. The radiation can be observed from the ITO side, and the metal electrode film serves as a reflective layer. The device structure mainly includes a substrate, a transparent electrode, an organic light emitting layer and the like. OLED organic light-emitting layer thickness is very thin (less than 500nm), so OLED devices can be made very thin. If the substrate material to metal or plastic film and other flexible base plate, but also can produce flexible OLED devices. In addition, select the appropriate transparent electrode and transparent substrate, can also be made transparent OLED devices. Because of its flat light, ultra-thin, transparent and flexible, and other unique advantages and high efficiency, energy saving, environmental protection and other advantages, in the display and lighting applications have great potential for both, has received extensive attention.


Second, OLED display technology


OLED display made according to the principle of light-emitting device is called organic light-emitting display, also known as OLED display. The preparation of the OLED display is completed by steps of substrate cleaning, anode pattern preparation, insulating layer isolation column preparation, light emitting layer evaporation, device packaging and module processing. The advantages of OLED display are: OLED structure is simple, low power consumption (the same power consumption, the display brightness higher); OLED fast response, dynamic images without smearing, can be very natural performance with a sense of motion images; OLED Wide viewing angle, from any point of view to see realistic and delicate picture, side view screen color without distortion; OLED for the active light, no backlight, thinner devices, higher contrast, more vivid colors; OLED high temperature performance, adaptable Cold and other special environment; so it is in the military and other special fields have broad application prospects. According to the different materials, organic light-emitting display can be divided into two categories: polymer devices and small-molecule devices. The development of small molecule devices earlier, more mature technology. The development of polymer devices began in 1990, the organic thin film and more spin coating and printing method of preparation. According to the different drive technology, organic light-emitting display can be divided into two categories: active and passive drive. Active drive is characterized by each luminous pixel has a corresponding independent drive components and a charge storage capacitor integrated in the display screen, in a frame scanning period, the luminous pixels are always in the light. The passive-driven display screen only luminous pixels, in a frame scanning period, the pixels should be lit only in the pixel is addressed within the time to light.


Third, OLED lighting technology


In the field of semiconductor lighting, OLED in addition to energy efficient, green and other characteristics, but also has some unique advantages: (1) flat light source, light soft; (2) can be realized flexible: can be prepared on a flexible substrate, (3) the preparation process is relatively simple: the preparation process without high temperature treatment, and even roll-to-roll process can be prepared, the future cost is expected to be lower than the inorganic LED devices; (4) a wide range of materials: OLED materials can be chemical synthesis Or modified to achieve the function of the update and optimization, luminous color in the visible light region can be adjusted (including red, green, blue and white). Therefore, white OLED in the field of lighting in the future has an attractive application prospects, have the opportunity to become a new generation of indoor solid-state lighting protagonist. Determine the white OLED two key indicators of industrialization and efficiency of life, the efficiency of the device reflects the electrical energy into light energy, life reflects its usefulness. At present, common white OLED lighting devices can be divided according to the use of materials for the whole fluorescent devices, fluorescent phosphorescence of the hybrid device and the total phosphorescent device. However, from the overall performance, the development trend of white OLED device structure for the whole phosphorescence structure, as well as fluorescent phosphorescence hybrid structure, in particular, blue fluorescent materials and red, green phosphorescent material laminated structure, because of its life advantage Become the application of a major development direction.

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