Organic EL lighting manufacturer-Nanjing First Organic Optoelectronics Co., Ltd. founder and CTO Tian Yuansheng gave a speech at the "OLEDs World Summit 2012" (San Francisco, September 26-28, 2012) at the International Seminar on Organic EL Technology, " Theoretically, the luminous efficiency of organic EL is the same as that of LED. The efficiency of organic LED lighting equipment can greatly exceed that of LED. " He said that organic EL devices can theoretically achieve a luminous efficiency of up to 249lm / W.
Tian Yuansheng was engaged in the research of organic EL in the original Eastman Kodak Company, "is a world-renowned organic EL expert" (technicians of Japanese organic EL manufacturers). Although he is still a US citizen, he left Kodak when Kodak sold the organic EL business to LG Group and established Nanjing First Organic Optoelectronics Company in Nanjing.
According to Tian Yuansheng, the theoretical limit value of the luminous efficiency of white light-emitting organic EL elements is "249lm / W when the color temperature is 4000K and the single-layer light-emitting structure is used, and 184lm / W when the tandem structure is used." The theoretical limit value is the luminous efficiency when the light extraction efficiency and the internal and external quantum efficiencies are all 100%. The theoretical limit of the luminous efficiency of white LED is about 260lm / W. If the organic EL adopts a single-layer light-emitting structure, the luminous efficiency can also be close to this value. Organic EL is also called organic light-emitting diode (organic LED, OLED), and it is not fundamentally different from LED in principle of light emission. From this point of view, it is not surprising that the theoretical values ​​of the luminous efficiency of the two are close.
In the organic EL devices actually produced before, there have been examples where the internal quantum efficiency is close to 100%, but the light extraction efficiency is only about 60% at most, which has not yet paved the theoretical path for improving to 100%.
Moreover, Tian Yuansheng said when comparing organic EL and LED lighting fixtures, "Even with the current organic EL technology, the luminous efficiency of lighting fixtures can compete with LED lighting." Tian Yuansheng cited the DOE MulTIyearPlan, an LED technology survey report published by the US Department of Energy (DOE) in March 2010, stating that "(before 2009) the luminous efficiency of LED lighting is only 32.3% of the LED light source (package)." If the LED light source is exposed to the lighting fixture, it will cause damage to the eyes, and the diffusion plate used to prevent this will reduce the luminous efficiency. Organic EL lighting often uses the light-emitting panel directly as a lighting appliance, rarely causing a significant reduction in luminous efficiency.
Note 1) However, the future development goal listed in this DOE report is to increase the luminous efficiency of LED lighting fixtures to 62.9% of LED light sources.
In addition, Nanjing First Organic Optoelectronics is currently advancing the development of organic EL lighting. Now the performance of luminous efficiency reaching 45lm / W and color rendering index CRI exceeding 90 has been achieved on a 200mm square panel.
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