Tian Yuansheng, founder and CTO of Nanjing Dihao Organic Optoelectronics Co., Ltd., delivered a speech at the OLED Technology World Symposium "OLEDs World Summit 2012". "In theory, the luminous efficiency of OLEDs is the same as that of LEDs. The efficiency of OLED lighting fixtures can be greatly exceeded. LED". He said that OLED components can theoretically achieve luminous efficiencies as high as 249 lm/W.
According to Tian Yuansheng, the theoretical limit value of the luminous efficiency of a white light-emitting OLED device is "249 lm/W when the color temperature is 4000 K and a single-layer light-emitting structure, and 184 lm/W when it is a series structure." The theoretical limit value is a luminous efficiency assuming that the light extraction efficiency and the internal and external quantum efficiencies are all 100%. The theoretical limit value of the luminous efficiency of white LED is about 260 lm/W. When the OLED adopts a single-layer light-emitting structure, the luminous efficiency can also be close to this value. OLED is also known as organic light-emitting diode (OLED), which is fundamentally different from LED in terms of light-emitting principle. From this point of view, it is not surprising that the theoretical values ​​of the luminous efficiencies of the two are close.
In the OLED components actually manufactured before, there have been examples in which the internal quantum efficiency is close to 100%, but the light extraction efficiency is only about 60% at most, and the theoretical road has not been paved for improvement to 100%.
Moreover, Tian Yuansheng said in comparing OLED and LED lighting fixtures, "Even with the current OLED technology, the luminous efficiency of lighting fixtures can compete with LED lighting." Tian Yuansheng quoted the DOE MultiyearPlan, published by the US Department of Energy (DOE) in March 2010, as saying that if the lighting fixture exposes the LED light source, it will cause eye damage, and the diffusion plate used to prevent this will be used. This leads to a decrease in luminous efficiency. OLED lighting often uses the illuminating panel directly as a lighting fixture, which rarely causes a significant reduction in luminous efficiency.
According to Tian Yuansheng, the theoretical limit value of the luminous efficiency of a white light-emitting OLED device is "249 lm/W when the color temperature is 4000 K and a single-layer light-emitting structure, and 184 lm/W when it is a series structure." The theoretical limit value is a luminous efficiency assuming that the light extraction efficiency and the internal and external quantum efficiencies are all 100%. The theoretical limit value of the luminous efficiency of white LED is about 260 lm/W. When the OLED adopts a single-layer light-emitting structure, the luminous efficiency can also be close to this value. OLED is also known as organic light-emitting diode (OLED), which is fundamentally different from LED in terms of light-emitting principle. From this point of view, it is not surprising that the theoretical values ​​of the luminous efficiencies of the two are close.
In the OLED components actually manufactured before, there have been examples in which the internal quantum efficiency is close to 100%, but the light extraction efficiency is only about 60% at most, and the theoretical road has not been paved for improvement to 100%.
Moreover, Tian Yuansheng said in comparing OLED and LED lighting fixtures, "Even with the current OLED technology, the luminous efficiency of lighting fixtures can compete with LED lighting." Tian Yuansheng quoted the DOE MultiyearPlan, published by the US Department of Energy (DOE) in March 2010, as saying that if the lighting fixture exposes the LED light source, it will cause eye damage, and the diffusion plate used to prevent this will be used. This leads to a decrease in luminous efficiency. OLED lighting often uses the illuminating panel directly as a lighting fixture, which rarely causes a significant reduction in luminous efficiency.
Computer Headphones are often used on computer, mainly for call, translation and live broadcast. Most of Compute Headset are with a microphone. Usually there are 2 kinds of plugs or jacks.
One is USB plug, which can be used on both laptop and desktop PC. Another is for 2 3.5mm jacks, which can only be used on desktop PC. There will be a small logo next to the two jacks of the desktop computer. The green circle shape is prepared for the headphone, while the pink microphone mark is for the microphone plug.
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