High-performance nanowire ultraviolet light-emitting diodes with potassium hydroxide and ammonium sulfide surface passivation

Abstract

Potassium hydroxide (KOH) and ammonium sulfide ( N H 4 ) 2 S x have been used as a surface passivation treatment to improve the electrical and optical performance of AlGaN nanowire ultraviolet (UV) light-emitting diodes (LEDs). Enhancements in photoluminescence at 335 nm (49%), optical output power (65%), and electroluminescence (83%), with respect to the as-grown nanowire LED are recorded for the AlGaN nanowire UV LEDs with surface passivation. These enhancements are attributed to the reduced nonradiative recombination on the nanowire surfaces. This study provides a potential surface passivation approach to produce high-power AlGaN nanowire LEDs operating in the UV spectrum.

Phosphor conversion for WLEDs: YBO3: Ce3+, Tb3+ and its effects on the luminous intensity and chromatic properties of dual-layer WLED model

“…Thus, the CQS is introduced as an alternative to the CRI one. The CQS not only accesses the CRI aspects, but also examines the color coordinate and human factorthe comfort of eyes when interacting with the light source [25,26]. Moreover, the color sample used for accuracy evaluation of CQS is increased to 15, not 8 samples as of the CRI.…”

The enhancement of the dual-layer phosphorus configuration in color uniformity and luminous flux of a light emitting diode

“…The Ca3-xSi2O4+2xN2-2x [10], [11] The enhancement of the dual-layer phosphorus configuration in color uniformity … (Phuc Dang Huu) 767 phosphors in the manufacture of a wLED using a near-ultraviolet (n-UV) LED are all discussed in this paper. The findings reveal that Ca3Si2 is thermally stable, and white LEDs made by Ca3Si2O4N2:Eu 2+ obtain great CRI [12], [13]. The Ca3Si2O4N2:Eu 2+ -based green phosphor is a viable contender for solid-state lighting sources.…”

The one-phase SrMg₂La₂W₂O₁₂:Tb³⁺, Sm³⁺, Tm³⁺ phosphor and its optical features in multicolor and white-illumination LEDs

“…Tb 3+ , Sm 3+ , and Tm 3+ ions are among the RE 3+ ions that may be co-doped in phosphor host substance to provide effective white illumination radiation. Tb 3+ is a key activator ion found within phosphors to be utilized in displays with even surface, three-chroma fluorescent lights, yellow-green tubes as well as displays based on amplifying x-ray [14]. Its radiation is mostly between 5 D4 and 5 D3 states and a 7 FJ (J=6, 5, 4, 3) multiplet inside the 4f 8 structure, with Tb 3+ radiation strengths varying with dopant concentration.…”