Effect of fabrication process on characteristics of phosphorescence organic light emitting diodes with methoxy-substituted starburst low-molecule as a host

Molecular hosts for triplet emitters in organic light-emitting diodes and the corresponding working principle

“…Taking Ir(ppy) 3 (3), the most intensively studied phosphorescent material in PhOLEDs, as an example, the variations of performance are demonstrated in Table 1, the features of host materials and different devices characteristics, together with device performance are compared, and the related references are listed for further survey [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44].…”

“…The efficiencies of Ir(ppy) 3 (3) based devices are highly dependent on the host and device configuration, with the maximum efficiencies of 105 cd/A (29%, or 133 lm/W) [ (20.2%, or 59.3 lm/W) [28], for high performances, 27.4 cd/A (4.5 lm/W) [42] and 20 cd/A [44] for relatively low performances. Utilizing suitable host and the optimizing of device structure according to device mechanism are very significant toward improving PhOLED performance.…”

“…Other tertiary amines tested as hosts for triplet emitters include F2PA (24) [78] and TDAPB (25) [44] (Figure 9). However, the device performances based on them are not as promising as other hosts.…”

“…The solution processed DM-TIBN (44) and Ir(ppy) 3 (3) based device exhibits maximum efficiencies of 27.3 cd/A and 7.3 lm/W. However, the driving voltages are rather high, e.g., the luminance turns on at 6.9.…”

Fabrication and Characterization of High Efficiency Green PhOLEDs with [TCTA-TAZ]:Ir(ppy)₃Double Emission Layer

“…11) 제작된 소자들에서 가장 우수한 효율 특성은 TCTA-TAZ(100 Å-200 Å) 조건에서 얻어졌 인가전압(휘도 상태: 10,000 cd/m2)에서 전류 효율 은 각각 47 cd/A와 24 cd/A로 나타났다. 47 cd/A의 전류 효율은 pin-구조의 소자(NOVALED) 12) 를 제외하고는 지 금까지 보고된 PhOLEDs 에서 가장 높은 값의 하나로 평가된다 [13][14][15]. 3.2 Ir(ppy) 3 의 농도에 따른 PhOLED 소자의 전기• 광학적 특성 Fig.…”