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中文摘要：
针对通常的突变异质结（HJ）结构的蓝色有机发光器件（OLED）稳定性差这一难题，制备了一种具有缓变结（GJ）的蓝色OLED，在空穴传输层（HTL）和发光层（EML）间构成GJ。与常规的HJOLED相比，具有GJ器件的稳定性明显提高。在初始亮度为100cd／m^2时半寿命达到6998h，是一般HJ器件的6倍。这主要是因为削弱了突变HJ产生的局部高电场，减少了产生的焦耳热，从而提高了器件的稳定性。但是，GJ器件效率相比HJ没有提高。因为GJ增大了空穴注入，空穴是多数载流子，这样不利于载流子的平衡。为了补偿效率损失，在TBADN／Alq界面上插入Gaq薄膜。由于Gaq的LUMO能级在Alq和TBADN的LUMO能级间，形成了从Alq经Gaq到TBADN的势垒阶梯，提高了电子注入，进而提高了器件效率。这种GJOaq器件的效率比一般GJ器件提高20％，寿命是HJ器件的7倍。
英文摘要：
A blue organic light emitting diode（OLED） with a graded j unction（GJ） at hole transporting layer（HTL） and emitted layer（EML） interface was constructed. Compared with the conventional heterojunction（HJ） OLED,GJ OLED exhibited significantly improved stability,and the half lifetime achieved 6998 h at initial luminance 100 cd/m^2,which is more than 6 times longer than that of HJ OLED. And a Gaq thin layer is inserted in the TBADN/Alq interface,the step barrier from Alq Gaq to TBADN for electron injection is though formed. The GJ devices with Gaq layer show 20%o higher efficiency than that of conventional and 7 times longer lifetime than that of HJ one.
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