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23.2: New Green and Red Phosphorescent Host Materials for Highly‐Efficient and Long‐Lifetime OLEDs
Author(s) -
Nishimura Kazuki,
Kawamura Yuichiro,
Kato Tomoki,
Numata Masaki,
Kawamura Masahiro,
Ogiwara Toshinari,
Yamamoto Hiroshi,
Iwakuma Toshihiro,
Jinde Yukitoshi,
Hosokawa Chishio
Publication year - 2009
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3256772
Subject(s) - phosphorescence , oled , common emitter , luminance , materials science , optoelectronics , luminous efficacy , host (biology) , power consumption , fluorescence , optics , power (physics) , nanotechnology , physics , layer (electronics) , ecology , quantum mechanics , biology
We successfully found new phosphorescent host materials. Red host material PRH‐01 with a red phosphorescent emitter achieved very high performance of 4.9 V, current efficiency of 20.2 cd/A and half lifetime of 150,000 hrs at an initial luminance of 1,000 cd/m 2 . We designed new molecular structure of green host material focusing on electron transport property and newly developed material PGH‐01 achieved very high performance of 5.3 V, 71.9 cd/A and half lifetime of 150,000 hrs at an initial luminance of 1,000 cd/m 2 . It was confirmed by simulation that these host materials have great potential to reduce power consumption of full‐color OLED displays. We also studied hybrid white OLEDs with combining the latest blue fluorescent material and the phosphorescent materials. High luminous efficacy of about 30 lm/W and long lifetime over 200,000 hrs at an initial luminance of 1,000 cd/m 2 without any light outcoupling structure were successfully obtained.