Highly circularly polarized white light using a combination of white polymer light-emitting diode and wideband cholesteric liquid crystal reflector

被引：5
作者：
Lee, Hyun-Jung [1 ]
Lee, Bo Ram [1 ]
Choi, Suk-Won [2 ]
Song, Myoung Hoon [1 ]
机构：
[1] UNIST, Sch Mech & Adv Mat Engn, Low Dimens Carbon Mat Ctr, Ulsan 689805, South Korea
[2] Kyung Hee Univ, Dept Adv Mat Engn Informat & Elect, Yongin 446701, Gyeonggi Do, South Korea
来源：
OPTICS EXPRESS | 2012年 / 20卷 / 22期
关键词：
HIGH-EFFICIENCY; DEVICES; ELECTROLUMINESCENCE; EMISSION; POLY(N-VINYLCARBAZOLE); ELECTROPHOSPHORESCENCE; POLYFLUORENE; THRESHOLD; DYES; FILM;
D O I：
10.1364/OE.20.024472
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We present a simple and intriguing device that generates highly circularly polarized white light. It comprises white polymer light-emitting diodes (WPLEDs) attached to a wideband cholesteric liquid crystal (CLC) reflector with a wide photonic bandgap (PBG) covering the visible range. The degree of circular polarization realized is very high over the visible range. The wide PBG was realized by introducing a gradient in pitch of the cholesteric helix by controlling the twisting power within the CLC medium. WPLEDs fabricated using a ternary (red, green, and blue) fluorescent polymer blend with the same moiety showed a low turn-on voltage, high brightness, high efficiency, and good color stability. (C) 2012 Optical Society of America
引用
收藏
页码：24472 / 24481
页数：10
相关论文
共 35 条
  • [1] Tunable and white light-emitting diodes of monolayer fluorinated benzoxazole graft copolymers
    Bai, SJ
    Wu, CC
    Dang, TD
    Arnold, FE
    Sakaran, B
    [J]. APPLIED PHYSICS LETTERS, 2004, 84 (10) : 1656 - 1658
  • [2] Very high-efficiency green organic light-emitting devices based on electrophosphorescence
    Baldo, MA
    Lamansky, S
    Burrows, PE
    Thompson, ME
    Forrest, SR
    [J]. APPLIED PHYSICS LETTERS, 1999, 75 (01) : 4 - 6
  • [3] Cholesteric liquid crystals with a helical pitch gradient: Spatial distribution of the concentration of chiral groups by Raman mapping in relation with the optical response and the microstructure
    Belalia, M.
    Mitov, M.
    Bourgerette, C.
    Krallafa, A.
    Belhakem, M.
    Bormann, D.
    [J]. PHYSICAL REVIEW E, 2006, 74 (05):
  • [4] LARGE APERTURE POLARIZED-LIGHT SOURCE AND NOVEL LIQUID-CRYSTAL DISPLAY OPERATING MODES
    BELAYEV, SV
    SCHADT, M
    BARNIK, MI
    FUNFSCHILLING, J
    MALIMONEKO, NV
    SCHMITT, K
    [J]. JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 1990, 29 (04): : L634 - L637
  • [5] Chandrasekhar S., 1992, Frontmatter Liquid Crystals
  • [6] Lowring lasing threshold in chiral nematic liquid crystal structure with different anisotropies
    Chee, Mu Guen
    Song, Myoung Hoon
    Kim, Doseok
    Takezoe, Hideo
    Chung, In Jae
    [J]. JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 2007, 46 (17-19): : L437 - L439
  • [7] White organic light-emitting devices for solid-state lighting
    D'Andrade, BW
    Forrest, SR
    [J]. ADVANCED MATERIALS, 2004, 16 (18) : 1585 - 1595
  • [8] Gennes P. d., 1995, PHYS LIQUID CRYSTALS
  • [9] Wetting in a phase separating polymer blend film:: Quench depth dependence
    Geoghegan, M
    Ermer, H
    Jüngst, G
    Krausch, G
    Brenn, R
    [J]. PHYSICAL REVIEW E, 2000, 62 (01): : 940 - 950
  • [10] White electrophosphorescence from semiconducting polymer blends
    Gong, X
    Ma, WL
    Ostrowski, JC
    Bazan, GC
    Moses, D
    Heeger, AJ
    [J]. ADVANCED MATERIALS, 2004, 16 (07) : 615 - +
1234