We describe the design and synthesis of a sterically hindered yellow dopant, tetra(t-butyl)rubrene (TBRb) which, when used as "replacement dopant" for rubrene (Rb) in either NPB or Alq_3 as emitter, shows a 34% to 50% increase in luminance efficiency over that of Rb device without significantly effecting its corresponding color. At 5% doping in Alq_3 and 20 mA/cm~2 current drive condition, the EL efficiency of TBRb reaches 5.6 cd/A and 1.99 Im/W with a yellow color coordinates of CIE-(x,y) = [0.51, 0.48]. We believe this EL performance is one of the best ever reported for yellow electrofluorescence in OLEDs.
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机译：我们描述了空间阻碍的黄色掺杂剂，四（叔丁基）毒物（TBRB）的设计和合成，当在NPB或ALQ_3中用作毒物（RB）的“替代掺杂剂”时，其显示为发射器，显示34％在RB器件的亮度效率下增加50％，而不会显着影响其相应颜色。在Alq_3和20mA / cm〜2电流驱动条件下以5％掺杂，TBRB的EL效率达到5.6CD / A和1.99 IM / W，具有CIE-（X，Y）= [0.51,0.48的黄色坐标]。我们认为这款EL性能是OLED中有史以来最好的黄色荧光的表现之一。
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