Abstract

An organic light-emitting device (OLED) is coupled with inorganic LEDs to strengthen the OLED's weak point (i.e., low luminous intensity). To this end, side-view LED bars are deployed on the sides of the glass substrate of OLED. To extract not only OLED light but also LED light from the glass substrate, a microlens array (MLA) film is attached to the outer surface of the glass substrate. It is found by experiments that the LED light intensity from the emission area of OLED is relatively low, compared with the OLED light intensity. Moreover, the LED light distribution is shown to be highly non-uniform. To tackle those problems, we introduce a scattering layer at the outer surface of the glass substrate. It is demonstrated by simulations that the luminous intensity and spatial uniformity of the LED light can be significantly enhanced with the aid of the scattering layer configuration where the scattering particle density is stepwisely varied.

© 2011 IEEE

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2010 (1)

H. R. Fallah, M. G. Varnamkhasti, M. J. Vahid, "Substrate temperature effect on transparent heat reflecting nanocrystalline ITO films prepared by electron beam evaporation," Renewable Energy 35, 1527-1530 (2010).

2009 (2)

J. W. Park, J. H. Lee, D. C. Shin, S. H. Park, "Luminance uniformity of large-area OLEDs with an auxiliary metal electrode," IEEE J. Display Technol. 5, 306-311 (2009).

T. Uchida, M. Wakana, M. Yahata, S. Dangtip, T. Osotchan, T. Satoh, Y. Sawada, "Blue flexible transparent organic light-emitting devices," IEEE J. Display Technol. 5, 188-191 (2009).

2008 (4)

S. Y. Ryu, J. H. Noh, B. H. Hwang, C. S. Kim, S. J. Jo, J. T. Kim, H. S. Hwang, H. K. Baik, H. S. Jeong, C. H. Lee, S. Y. Song, S. H. Choi, S. Y. Park, "Transparent organic light-emitting diodes consisting of a metal oxide multilayer cathode," Appl. Phys. Lett. 92, 023306-1-3 (2008).

K. S. Yook, S. O. Jeon, C. W. Joo, J. Y. Lee, "Transparent organic light emitting diodes using a multilayer oxide as a low resistance transparent cathode," Appl. Phys. Lett. 93, 013301-1-3 (2008).

S. H. Choi, T. I. Lee, H. K. Baik, H. H. Roh, O. Y. Kwon, D. H. Suh, "The effect of electrode heat sink in organic-electronic devices," Appl. Phys. Lett. 93, 183301-1-3 (2008).

L. S. Liao, K. P. Klubek, "Power efficiency improvement in a tandem organic light-emitting diode," Appl. Phys. Lett. 92, 223311-1-3 (2008).

2006 (3)

H. Kanno, Y. Hamada, K. Nishimura, K. Okumoto, N. Saito, H. Ishida, H. Takahashi, K. Shibath, K. Mameno, "High efficiency stacked organic light-emitting diodes employing Li$_{2}$O as a connecting layer," Jpn. J. Appl. Phys. 45, 9219-9223 (2006).

J. W. Park, Y. Kawakami, "Temperature-dependent dynamic behaviors of organic light-emitting diode," IEEE J. Display Technol. 2, 333-340 (2006).

Y. Sun, N. Giebink, H. Kanno, B. Wa, M. E. Thompson, S. R. Forrest, "Management of singlet and triplet excitons for efficient white organic light-emitting devices," Nature 440, 908-912 (2006) (London).

2005 (1)

K. Leo, "Organic LEDs look forward to a bright, white future," Science 310, 1762-1763 (2005).

2004 (1)

M.-K. Wei, I.-L. Su, "Method to evaluate the enhancement of luminance efficiency in planar OLED light emitting devices for microlens array," Opt. Exp. 12, 5777-5782 (2004).

2000 (2)

M. W. Shin, H. C. Lee, K. S. Kim, S. H. Lee, J. C. Kim, "Thermal analysis of tris (8-hydroxyquinoline) aluminum," Thin Solid Films 363, 244-247 (2000).

G. Parthasarathy, C. Adachi, P. E. Burrows, S. R. Forrest, "High-efficiency transparent organic light-emitting devices," Appl. Phys. Lett. 76, 2128-2130 (2000).

1990 (1)

R. G. C. Beerkens, "Chemical equilibrium reactions as driving forces for growth of gas bubbles during refining," Glastechn. Ber. 63K, 222-242 (1990).

Appl. Phys. Lett. (5)

S. H. Choi, T. I. Lee, H. K. Baik, H. H. Roh, O. Y. Kwon, D. H. Suh, "The effect of electrode heat sink in organic-electronic devices," Appl. Phys. Lett. 93, 183301-1-3 (2008).

G. Parthasarathy, C. Adachi, P. E. Burrows, S. R. Forrest, "High-efficiency transparent organic light-emitting devices," Appl. Phys. Lett. 76, 2128-2130 (2000).

S. Y. Ryu, J. H. Noh, B. H. Hwang, C. S. Kim, S. J. Jo, J. T. Kim, H. S. Hwang, H. K. Baik, H. S. Jeong, C. H. Lee, S. Y. Song, S. H. Choi, S. Y. Park, "Transparent organic light-emitting diodes consisting of a metal oxide multilayer cathode," Appl. Phys. Lett. 92, 023306-1-3 (2008).

K. S. Yook, S. O. Jeon, C. W. Joo, J. Y. Lee, "Transparent organic light emitting diodes using a multilayer oxide as a low resistance transparent cathode," Appl. Phys. Lett. 93, 013301-1-3 (2008).

L. S. Liao, K. P. Klubek, "Power efficiency improvement in a tandem organic light-emitting diode," Appl. Phys. Lett. 92, 223311-1-3 (2008).

Glastechn. Ber. (1)

R. G. C. Beerkens, "Chemical equilibrium reactions as driving forces for growth of gas bubbles during refining," Glastechn. Ber. 63K, 222-242 (1990).

IEEE J. Display Technol. (3)

T. Uchida, M. Wakana, M. Yahata, S. Dangtip, T. Osotchan, T. Satoh, Y. Sawada, "Blue flexible transparent organic light-emitting devices," IEEE J. Display Technol. 5, 188-191 (2009).

J. W. Park, J. H. Lee, D. C. Shin, S. H. Park, "Luminance uniformity of large-area OLEDs with an auxiliary metal electrode," IEEE J. Display Technol. 5, 306-311 (2009).

J. W. Park, Y. Kawakami, "Temperature-dependent dynamic behaviors of organic light-emitting diode," IEEE J. Display Technol. 2, 333-340 (2006).

Jpn. J. Appl. Phys. (1)

H. Kanno, Y. Hamada, K. Nishimura, K. Okumoto, N. Saito, H. Ishida, H. Takahashi, K. Shibath, K. Mameno, "High efficiency stacked organic light-emitting diodes employing Li$_{2}$O as a connecting layer," Jpn. J. Appl. Phys. 45, 9219-9223 (2006).

Nature (1)

Y. Sun, N. Giebink, H. Kanno, B. Wa, M. E. Thompson, S. R. Forrest, "Management of singlet and triplet excitons for efficient white organic light-emitting devices," Nature 440, 908-912 (2006) (London).

Opt. Exp. (1)

M.-K. Wei, I.-L. Su, "Method to evaluate the enhancement of luminance efficiency in planar OLED light emitting devices for microlens array," Opt. Exp. 12, 5777-5782 (2004).

Renewable Energy (1)

H. R. Fallah, M. G. Varnamkhasti, M. J. Vahid, "Substrate temperature effect on transparent heat reflecting nanocrystalline ITO films prepared by electron beam evaporation," Renewable Energy 35, 1527-1530 (2010).

Science (1)

K. Leo, "Organic LEDs look forward to a bright, white future," Science 310, 1762-1763 (2005).

Thin Solid Films (1)

M. W. Shin, H. C. Lee, K. S. Kim, S. H. Lee, J. C. Kim, "Thermal analysis of tris (8-hydroxyquinoline) aluminum," Thin Solid Films 363, 244-247 (2000).

Other (9)

L. Pohl, E. Kollár, Zs. Kohári, A. Poppe, "Electro-thermal investigation of OLEDs," Therminic (2008) pp. 235-240.

A. Žukauskas, M. S. Shur, R. Caska, Introduction to Solid-State Lighting (Wiley, 2002).

J. Kido, "High performance OLEDs for displays and general lighting," SID pp. 931-932 (2008).

J. Amelung, "Large-area organic light-emitting diode technology," http://spie.org/x23960.xml.

H.-Y. Lin, J.-H. Lee, M.-K. Wei, K.-Y. Chen, S.-C. Hsu, Y.-H. Ho, C.-Y. Lin, "Optical characteristics of the OLED with microlens array film attachment," Proc. SPIE (2007) pp. 66551H-1-6.

https://www.lumimicro.com/.

http://www.opticalres.com/lt/ltprodds_f.html.

http://mntech.co.kr:1014/new_eng/sub2/sub2.php?smenu=sub2&stitle=subtitle2_2.

N. Nakamura, N. Fukumoto, F. Sinapi, N. Wada, Y. Aoki, K. Maeda, "Glass substrates for OLED lighting with high out-coupling efficiency," SID pp. 603-906 (2009).

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