We have introduced a three-component light-emitting layer consisting of a host, a phosphorescent assist dopant, and a phosphorescent emitter to simultaneously realize high efficiency and long lifetime in NIR organic LEDs. An efficient energy transfer between the two phosphorescent materials was observed with 1 wt% doping ratio of the NIR emitter, significantly enhancing the external quantum efficiency reaching 10.5% with an emission peak at 769 nm. The device showed a low drive voltage and a long operational lifetime, with a luminance decay of less than 11% from the initial value after 4800 h under accelerated conditions of 100 mA cm⁻².

中文翻译：

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利用磷光辅助掺杂剂的共振能量转移，近红外磷光 OLED 具有超过 10% 的外量子效率和极长的寿命

我们推出了由主体、磷光辅助掺杂剂和磷光发射体组成的三组分发光层，可同时实现近红外有机 LED 的高效率和长寿命。在近红外发射体掺杂率为 1 wt% 时，观察到两种磷光材料之间的有效能量转移，显着提高了外量子效率，达到 10.5%，发射峰在 769 nm 处。该器件表现出低驱动电压和长工作寿命，在100 mA cm ^-2的加速条件下4800小时后亮度从初始值衰减小于11% 。