Quick Jump

Jpn. J. Appl. Phys. 42 (2003) pp. L20-L23  |Next Article|  |Table of Contents|
|Full Text PDF (107K)| |Buy This Article|

Letter

Red-Enhanced White-Light-Emitting Diode Using a New Red Phosphor

Motokazu Yamada, Takahiro Naitou, Kunihiro Izuno, Hiroto Tamaki¹, Yoshinori Murazaki¹, Masatoshi Kameshima¹ and Takashi Mukai²

Advanced LED Development Center, Optoelectronics Products Division, Nichia Corporation, 491 Oka, Kaminaka, Anan, Tokushima 774-8601, Japan
¹R&D Department, Phosphors and Finechemicals Division, Nichia Corporation, 491 Oka, Kaminaka, Anan, Tokushima 774-8601, Japan
²Department of Nitride Semiconductor Research Laboratory, Optoelectronics Products Division, Nichia Corporation,
491 Oka, Kaminaka, Anan, Tokushima 774-8601, Japan

(Received November 18, 2002; revised manuscript revised December 3, 2002; accepted for publication December 4, 2002)

We fabricated a high-color-rendering, red-enhanced white-light-emitting diode (LED) using a new red phosphor and a short-wavelength YAG phosphor. When the new white-LED was operated at a forward-bias current of 20 mA at room temperature (RT), color temperature (T_cp), the general color rendering index (R_a) and luminous efficiency were 4670 K, 87.7 and 25.5 lm/W, respectively. Most of the color-rendering indexes (CRIs) of the new white-LED were larger than those of current white-LEDs, in which only YAG is used. In particular, the CRI-No.9 value, which shows the color reproduction in the red region, is improved from -2.5 to 62.6.

URL: http://jjap.jsap.jp/link?JJAP/42/L20/
DOI: 10.1143/JJAP.42.L20

|Full Text PDF (107K)| |Buy This Article| Citation: Plain Text BiBTeX EndNote(RIS) RSS

---

References | Citing Articles (85)

1. S. Nakamura, T. Mukai and M. Senoh: Appl. Phys. Lett. 64 (1994) 1687[AIP Scitation].
2. S. Nakamura, T. Mukai, M. Senoh and N. Iwasa: J. Appl. Phys. 76 (1994) 8189[AIP Scitation].
3. K. Tadatomo, H. Okagawa, Y. Ohuchi, T. Tsunekawa, Y. Imada, M. Kato and T. Taguchi: Jpn. J. Appl. Phys. 40 (2001) L583[JSAP].
4. J. Narayan, H. Wang, J. Ye, S. J. Hon, K. Fox, J. C. Chen, H. K. Choi and J. C. Fan: J. Appl. Phys. 81 (2002) 841[AIP Scitation].
5. S. Nakamura, M. Senoh, S. Nagahama, N. Iwasa, S. Nagahama, T. Yamada and T. Mukai: Jpn. J. Appl. Phys. 34 (1995) L1332[JSAP].
6. T. Mukai, D. Morita and S. Nakamura: J. Cryst. Growth 189/190 (1998) 778.
7. T. Mukai, M. Yamada and S. Nakamura: Jpn. J. Appl. Phys. 37 (1998) L1358[JSAP].
8. T. Mukai, H. Narimatsu and S. Nakamura: Jpn. J. Appl. Phys. 37 (1998) L479[JSAP].
9. M. Yamada, Y. Narukawa and T. Mukai: Jpn. J. Appl. Phys. 41 (2002) L246[JSAP].
10. S. Nakamura and G. Fasol: The Blue Laser Diode: GaN Based Light Emitters and Lasers (Springer, Berlin, 1997).
11. Y. Narukawa, I. Niki, K. Izuno, M. Yamada, Y. Murazaki and T. Mukai: Jpn. J. Appl. Phys. 41 (2002) L371[JSAP].
12. K. Bando: Proc. Asia Display/IDW'01, Nagoya, 2001 (ITE and SID, Japan, 2001) p. 545.
13. R. Mueller-Mach, G. O. Mueller, M. R. Krames and T. Trottier: IEEE J. Sel. Top. Quantum Electron 8 (2002) 339.

---