청색과 적색 인광 물질을 사용한 백색 적층 OLED의 발광 특성
Emission Characteristics of White Tandem Organic Light Emitting Diodes Using Blue and Red Phosphorescent Materials
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We studied white tandem organic light-emitting diodes using blue and red phosphorescent materials. Optimized white single phosphorescent OLED was fabricated using CBP : FIrpic (12 vol.%, 9 nm) / CBP : Ir(mphmq)2acac : Ir(ppy)3 (1 vol.%, 1 vol.%, 1 nm) as emitting layer (EML). The single phosphorescent OLED showed maximum current efficiency of 22.5 cd/A, white emission with a Commission Internationale de l'Eclairage (CIE) coordinates of (0.342, 0.37) at 1,000 cd/m2, and variation of CIE coordinates with (0.339 ± 0.008, 0.371 ± 0.001) from 500 to 3,000 cd/m2. Optimized white tandem phosphorescent OLED was fabricated using CBP : FIrpic (12 vol.%, 7 nm) / CBP : Ir(mphmq)2acac : Ir(ppy)3 (1 vol.%, 1 vol.%, 3 nm) as EML. The tandem phosphorescent OLED showed maximum current efficiency of 49.2 cd/A, white emission with a CIE coordinates of (0.376, 0.366) at 1,000 cd/m2, variation of CIE coordinates with (0.375 ± 0.004, 0.367 ± 0.002) from 500 to 3,000 cd/m2. Maximum current efficiency of tandem phosphorescent OLED was more twice as high as single phosphorescent OLED. Our results suggest that tandem phosphorescent OLED was possible to control CIE coordinates and produce excellent color stability.
Abstract
We studied white tandem organic light-emitting diodes using blue and red phosphorescent materials. Optimized white single phosphorescent OLED was fabricated using CBP : FIrpic (12 vol.%, 9 nm) / CBP : Ir(mphmq)2acac : Ir(ppy)3 (1 vol.%, 1 vol.%, 1 nm) as emitting layer (EML). The single phosphorescent OLED showed maximum current efficiency of 22.5 cd/A, white emission with a Commission Internationale de l'Eclairage (CIE) coordinates of (0.342, 0.37) at 1,000 cd/m2, and variation of CIE coordinates with (0.339 ± 0.008, 0.371 ± 0.001) from 500 to 3,000 cd/m2. Optimized white tandem phosphorescent OLED was fabricated using CBP : FIrpic (12 vol.%, 7 nm) / CBP : Ir(mphmq)2acac : Ir(ppy)3 (1 vol.%, 1 vol.%, 3 nm) as EML. The tandem phosphorescent OLED showed maximum current efficiency of 49.2 cd/A, white emission with a CIE coordinates of (0.376, 0.366) at 1,000 cd/m2, variation of CIE coordinates with (0.375 ± 0.004, 0.367 ± 0.002) from 500 to 3,000 cd/m2. Maximum current efficiency of tandem phosphorescent OLED was more twice as high as single phosphorescent OLED. Our results suggest that tandem phosphorescent OLED was possible to control CIE coordinates and produce excellent color stability.
참고문헌 (13)
- 박찬석, "청색 형광과 적색 인광 물질을 사용한 백색 OLED의 발광 특성", 전기전자재료학회논문지, 28(11), pp.704~710 (2015), 한국전기전자재료학회[DOI]
- C. W. Tang, "Organic electroluminescent diodes", Appl. Phys. Lett, 51, pp.913~915 (1987)
- J. Kido, "Multilayer white light-emitting organic electroluminescent devices", Science, 267, pp.1332~1334 (1995)
- 임정아, "OLED 내구성에 미치는 무기", 에폭시층 보호막의 영향, 2009, pp.42(6), 287~293[DOI]
- F. Jing, "White light emission from exciplex using tris-(8-hydroxyquinoline)aluminum as chromaticity-tuning layer", Appl. Phys. Lett, 78, pp.3947~3949 (2001)
- C. W. Ko, "Bright white organic lightemitting diode", Appl. Phys. Lett, 79, pp.4234~4236 (2001)
- 박찬석, "적색과 청색 형광 물질을 사용한 백색 적층 OLED", 한국표면공학회지, 48(3), pp.115~120 (2015), 한국표면공학회[DOI]
- V. Sivasubramaniam, "Fluorine cleavage of the light blue heteroleptic triplet emitter FIrpic", J. Fluor. Chem, 130, pp.640~649 (2009)
- J. H. Seo, "Efficient blue-green organic light-emitting diodes based on heteroleptic tris-cyclometalated iridium(III)complexes", Thin Solid Films, 517, pp.1807~1810 (2009)
- M. -Y. Chan, "Influences of connecting unit architecture on the performance of tandem organic light-emitting devices", Adv. Funct. Mater, 17, pp.2509~2514 (2007)
- J. H. Burroughes, "Light-emitting diodes based on conjugated polymers", Nature, 347, pp.539~541 (1990)
- Y. H. Son, "Good color stable phosphorescent white organic light-emitting diodes with double emissive layer structure", Organic Electronics, 14, pp.1183~1188 (2013)
- 김지현, "CGL 층으로 MoOx를 사용한 다중 적층구조 OLED의 발광 특성", 한국표면공학회지, 48(3), pp.105~109 (2015), 한국표면공학회[DOI]