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According to reports, this value is obtained by integrating sphere measurement. Without output coupling, the output coupling can propose more light from the light-emitting device, which will optimize the measurement results. The OLED sample is uniformly distributed by using a special injection electrode on the light-emitting surface, so that a uniform optical density can be obtained at each angle.
Osram specifically pointed out that OLED light efficiency and brightness are highly correlated, and the light efficiency measured at 5000 cd/m2 brightness is about 75 lm/W. 
Osram Labs Announces Breakthrough of 87lm/W for OLED Light Efficiency
[High-tech LED News] Osram Labs has announced new results in OLED research. The brightness is 1000cd/m2, the color temperature is about 4000K, and the OLED light efficiency is up to 87lm/W. Osram is currently undergoing pilot production testing and is evaluating its feasibility.