OLED and LED comprehensively compete against each other

The screen can be bent, the phone can be folded, and the TV screen is as thin as paper; the transparent windows during the day can let light in, and it can become a light source at night; navigation information can be played through the car windshield. The beauty of these future electronic products is due to OLED technology. Therefore, OLED will eventually dominate the field of display and lighting in the future.

How OLED works

OLED refers to the phenomenon that organic semiconductor materials and light-emitting materials cause light emission through carrier injection and recombination under the drive of an electric field. The principle uses ITO transparent electrode and metal electrode as the anode and cathode of the device, respectively, under a certain voltage drive, electrons and holes migrate to the light-emitting layer through the electron and hole transport layer, and meet in the light-emitting layer to form excitons The luminescent molecules are excited, and the luminescent molecules emit visible light through radiation. The radiated light can be observed from the ITO side, and the metal electrode film also functions as a reflective layer. Judging from the current technological development of organic point excitation light elements, green light, blue light, and red light all have related material research and development, and the technology of green light is the most mature.

White light OLED

There are two main methods to realize white light OLED for lighting: one is the wavelength conversion method, which uses blue-emitting OLEDs to excite yellow, orange, red fluorescent or phosphor powder to achieve white light. The second is the color mixing method, which is a method of achieving white light by doping or multi-layering using two types of compensation light, blue or orange, or three primary colors of red, green, and blue.

The theoretical luminous efficiency of OLED can reach nearly 200lm / w; the industrial target of OLED in lighting application is 1.000cd / ㎡, reaching an efficiency of 50 ~ 80lm / w; at present, the white light OLED products used for lighting can reach 60lm Above / w, the color rendering index is around 80.

OLED lighting applications

Taking advantage of the large area of ​​OLED lighting, large-area OLED light sources can be installed on the ceiling and walls, so that the entire ceiling and walls emit soft light on the whole surface, instead of local lighting like bulbs and fluorescent lights, so that the light source allows People feel more gentle and comfortable.

In addition, a hanging type lighting fixture can be produced in accordance with the design of the lighting mechanism, which can present a lighting device with adjustable angle. You can also take advantage of the light and thin characteristics of OLED lighTIng, in addition to designing sheet-like lighting fixtures, so that the light fixtures can be light enough to sway with the wind, so that general lighting can show the lighting feeling of different situations. OLED lighting can provide a higher degree of freedom in the design of lighting fixtures, so that lighting can present more application scenarios.

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