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18.5: Size‐dependence Characterization of GaN‐based Green Micro‐LED
Author(s) -
Zhanghu Mengyuan,
Feng Yang,
Liu Zhaojun
Publication year - 2021
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.15082
Subject(s) - light emitting diode , materials science , current crowding , optoelectronics , biasing , diode , current (fluid) , electroluminescence , voltage , diffusion , indium gallium nitride , gallium nitride , nanotechnology , physics , layer (electronics) , quantum mechanics , thermodynamics
GaN‐based light‐emitting diode (LED) arrays are a promising technology in a wide range of applications. Research on size dependence performance is important in GaN‐based LED. In this paper, we study the electrical properties of 100µm, 150µm, and 200µm devices. The ideal factor is calculated by measuring the current density‐voltage characteristics to study the carrier transport mechanism. It is found that the forward low bias voltage part is mainly composed of recombination current and diffusion current. The current density in the high bias voltage part depends on the current crowding effect. The temperature variation study proves that the ideal factor has no size dependence. Besides, the electroluminescence (EL) spectrum is studied to understand size dependence in GaN internal structure. As the size decreases, the quantum confinement Stark effect (QCSE) will be suppressed, which is proved by the relationship between optical power and turn‐on voltage. These studies indicate that the application of Micro‐LED and even smaller‐sized Micro‐LEDs has unlimited possibilities and broad prospects.