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为了充分利用发光层中主客体间的能量转移和空穴阻挡层(HBL)的空穴阻挡作用,制作了结构为ITO/m-MTDATA(25 nm)/NPB(15 nm)/Ir(ppz)3(10 nm)/Simcp:Firpic(30 nm,6%)/HBL(35 nm)/LiF(1 nm)/Al(200 nm)的高效率蓝光器件,研究了3种类型的HBL对蓝光器件电流效率的影响。结果表明,HOMO能级较低的BCP是性能最好的空穴阻挡材料,以其为HBL,当厚度为35 nm时,8 V电压下器件的最大电流效率达到14.57 cd/A。
In order to make full use of the energy transfer between host and guest in the light emitting layer and the hole blocking function of the hole blocking layer (HBL), a structure with ITO / m-MTDATA (25 nm) / NPB (15 nm) / Ir The high efficiency blue light devices with 3 types of HBL (3 nm × 10 6 nm) / Simcp: Firpic (30 nm, 6%) / HBL (35 nm) / LiF (1 nm) / Al Effect of current efficiency. The results show that BCP with the lower HOMO level is the best hole-blocking material for HBL, and the maximum current efficiency of the device reaches 14.57 cd / A at a voltage of 8 V with a thickness of 35 nm.