All Stories

  1. Discrete AlN mole fraction of n/12 (n = 4–8) in Ga-rich zones functioning as electron pathways created in nonflat AlGaN layers grown on high-miscut sapphire substrates

    Article • Journal of Applied Physics, April 2021, American Institute of Physics

    Dr. Akira Hirano

  2. Detailed analysis of Ga-rich current pathways created in an n-Al0.7Ga0.3N layer grown on an AlN template with dense macrosteps

    Article • Applied Physics Express, December 2020, Institute of Physics Publishing

    Dr. Kazunobu Kojima, Dr. Akira Hirano

  3. Self-organized micro-light-emitting diode structure for high-speed solar-blind optical wireless communications

    Article • Applied Physics Letters, July 2020, American Institute of Physics

    Dr. Kazunobu Kojima, Dr. Akira Hirano

  4. Two-dimensional analysis of the nonuniform IQE of nonflat QWs for AlGaN-based deep-ultraviolet LEDs

    Article • Journal of Applied Physics, December 2019, American Institute of Physics

    Dr. Kazunobu Kojima, Dr. Akira Hirano

  5. Review for encapsulating DUV-LEDs.

    Article • Photonics Research, August 2019, Optical Society of America (OSA)

    Dr. Akira Hirano

  6. Around 285 nm, difference of LED will appear

    Article • Applied Physics Express, May 2019, Japan Society of Applied Physics

    Dr. Akira Hirano, Dr. Kazunobu Kojima

  7. Carrier localization structure combined with current micropaths.

    Article • Applied Physics Letters, January 2019, American Institute of Physics

    Dr. Akira Hirano, Dr. Kazunobu Kojima

  8. DUV-LED has high response speed.

    Article • January 2019, Optical Society of America (OSA)

    Dr. Akira Hirano, Dr. Kazunobu Kojima

  9. A Review of AlGaN-Based Deep-Ultraviolet Light-Emitting Diodes on Sapphire

    Article • Applied Sciences, July 2018, MDPI AG

    Dr. Akira Hirano

  10. Very brief review of DUV-LEDs including resin encapsulation

    Article • September 2016, SPIE

    Dr. Akira Hirano

  11. Ends of fluorine molecular stucture for encapsulating DUV-LEDs has been determined as -CF3.

    Article • Japanese Journal of Applied Physics, July 2016, Japan Society of Applied Physics

    Dr. Akira Hirano

  12. Development of underfilling and encapsulation for deep-ultraviolet LEDs

    Article • Applied Physics Express, December 2014, Japan Society of Applied Physics

    Dr. Akira Hirano

  13. Development of AlGaN DUV-LED

    Article • June 2013, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Akira Hirano

  14. Improvement of Light Extraction Efficiency for AlGaN-Based Deep Ultraviolet Light-Emitting Diodes

    Article • Japanese Journal of Applied Physics, December 2011, Japan Society of Applied Physics

    Dr. Akira Hirano

  15. Improvement of Light Extraction Efficiency for AlGaN-Based Deep Ultraviolet Light-Emitting Diodes

    Article • Japanese Journal of Applied Physics, November 2011, Japan Society of Applied Physics

    Dr. Akira Hirano, Motoaki Iwaya

  16. AlGaN-Based Deep Ultraviolet Light-Emitting Diodes Fabricated on Patterned Sapphire Substrates

    Article • Applied Physics Express, August 2011, Institute of Physics Publishing

    Dr. Akira Hirano, Motoaki Iwaya

  17. Frontispiece: Development of high efficiency 255-355 nm AlGaN-based light-emitting diodes (Phys. Status Solidi A 7/2011)

    Article • phys stat sol (a), July 2011, Wiley

    Dr. Akira Hirano

  18. Updated EQE in 2011. 5% at 285 nm was recorded.

    Article • phys stat sol (a), May 2011, Wiley

    Dr. Akira Hirano, Motoaki Iwaya

  19. Improved Efficiency of 255–280 nm AlGaN-Based Light-Emitting Diodes

    Article • Applied Physics Express, June 2010, Institute of Physics Publishing

    Dr. Akira Hirano, Motoaki Iwaya

  20. Demonstration of Flame Detection in Room Light Background by Solar-Blind AlGaN PIN Photodiode

    Article • phys stat sol (a), November 2001, Wiley

    Dr. Akira Hirano

  21. Demonstration of Flame Detection in Room Light Background by Solar-Blind AlGaN PIN Photodiode

    Article • phys stat sol (a), November 2001, Wiley

    Dr. Akira Hirano, Motoaki Iwaya

  22. Solar-Blind UV Photodetectors Based on GaN/AlGaN p-i-n Photodiodes

    Article • Japanese Journal of Applied Physics, May 2000, Japan Society of Applied Physics

    Dr. Akira Hirano, Motoaki Iwaya

  23. Detailed feasibility study on a flame detector using AlGaN photosensors

    Article • April 2000, SPIE

    Dr. Akira Hirano

  24. Improvement of Low-Intensity Ultraviolet Photodetectors Based on AlGaN with Low Threading Dislocation Density

    Article • phys stat sol (a), November 1999, Wiley

    Dr. Akira Hirano, Motoaki Iwaya

  25. Low-Intensity Ultraviolet Photodetectors Based on AlGaN

    Article • Japanese Journal of Applied Physics, May 1999, Japan Society of Applied Physics

    Dr. Akira Hirano, Motoaki Iwaya

  26. Accurate Thermometry Using NO and OH Laser-Induced Fluorescence in an Atmospheric Pressure Flame. Checked by Narrow-Band N2 Coherent Anti-Stokes Raman Scattering.

    Article • JSME International Journal Series B, January 1999, Japan Society of Mechanical Engineers

    Dr. Akira Hirano

  27. Investigation of the Leakage Current in GaN P-N Junctions

    Article • Japanese Journal of Applied Physics, October 1998, Japan Society of Applied Physics

    Dr. Akira Hirano

  28. The imaging diagnositics of flames by means of planar laser-induced fluorescence

    Article • Optics & Laser Technology, February 1997, Elsevier

    Dr. Akira Hirano

  29. Two-dimensional quenching lifetime measurement of OH:A 2 ? +(?? = 1) and NO:A 2 ?(?? = 0) in atmospheric-pressure flames

    Article • Applied Physics B Photophysics and Laser Chemistry, March 1996, Springer Science + Business Media

    Dr. Akira Hirano

  30. Visualization of CN by the use of planar laser-induced fluorescence in a cross section of an unseeded turbulent CH_4–air flame

    Article • Applied Optics, November 1994, Optical Society of America (OSA)

    Dr. Akira Hirano

  31. Visualization of Low-Concentration Species in a Turbulent Premixed CH4/Air Flame.

    Article • TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B, January 1994, Japan Society of Mechanical Engineers

    Dr. Akira Hirano

  32. Visualization of the CH Molecule by Exciting C2Σ+(v=1) State in Turbulent Flames by Planar Laser-Induced Fluorescence

    Article • Japanese Journal of Applied Physics, December 1993, Japan Society of Applied Physics

    Dr. Akira Hirano

  33. Two-Dimensional Direct Quenching Measurement of OH in a Cross Section of a Bunsen Flame

    Article • Japanese Journal of Applied Physics, July 1993, Japan Society of Applied Physics

    Dr. Akira Hirano

  34. Measurements of Flow Mechanism in Fluidic Gas Meters by LDV

    Article • January 1993, Springer Science + Business Media

    Dr. Akira Hirano

  35. Two-dimensional digital imaging of the CH distribution in a natural gas/oxygen flame at atmospheric pressure and detection of A-state emission by means of C-state excitation

    Article • Optics Letters, February 1992, Optical Society of America (OSA)

    Dr. Akira Hirano

  36. Two-Dimensional Imaging of Laser Induced Fluorescence in Premixed Natural Gas Flame.

    Article • TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B, January 1992, Japan Society of Mechanical Engineers

    Dr. Akira Hirano