Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
Journal Home About Issues in Progress Current Issue All Issues Feature Issues

Enhancing the conversion efficiency of red emission by spin-coating CdSe quantum dots on the green nanorod light-emitting diode

Ya-Ju Lee, Chia-Jung Lee, and Chun-Mao Cheng

Open Access Open Access

Abstract

A hybrid structure of CdSe quantum dots (QDs) (λ = 640nm) spin-coated on the indium gallium nitride (InGaN) nanorod light-emitting diode (LED, λ = 525nm) is successfully fabricated. Experimental results indicate that the randomness and the minuteness of nanorods scatter the upcoming green light into the surrounding CdSe QDs efficiently, subsequently alleviating the likelihood of the emitted photons of red emission being recaptured by the CdSe QDs (self-absorption effect), and that increases the coupling probability of emission lights and the overall conversion efficiency. Moreover, the revealed structure with high color stability provides an alternative solution for general lighting applications of next generation.

©2010 Optical Society of America

Full Article  |  PDF Article
More Like This
High-efficiency CdSe/CdS nanorod–based red light–emitting diodes

Yanbin Zhang, Fengjuan Zhang, Hongzhe Wang, Lei Wang, Fangfang Wang, Qingli Lin, Huaibin Shen, and Lin Song Li
Opt. Express 27(6) 7935-7944 (2019)

Color-conversion efficiency enhancement of quantum dots via selective area nano-rods light-emitting diodes

Che-Yu Liu, Tzu-Pei Chen, Tsung Sheng Kao, Jhih-Kai Huang, Hao-Chung Kuo, Yang-Fang Chen, and Chun-Yen Chang
Opt. Express 24(17) 19978-19987 (2016)

Nanoscale-cavity enhancement of color conversion with colloidal quantum dots embedded in the surface nano-holes of a blue-emitting light-emitting diode

Yang-Yi Huang, Zong-Han Li, Yi-Cheng Lai, Jun-Chen Chen, Shung-Hsiang Wu, Shaobo Yang, Yang Kuo, Chih-Chung Yang, Ta-Cheng Hsu, and Chi-Ling Lee
Opt. Express 30(17) 31322-31335 (2022)

View More...

Cited By

Optica participates in Crossref's Cited-By Linking service. Citing articles from Optica Publishing Group journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (7)
Fig. 1
Fig. 1 (a) Photoluminescence and absorption spectra of pure CdSe QDs. Schematic cross-sectional view of PL setup: hybrid structures of colloidal CdSe QDs spin-coated on (b) planar (sample A) and (c) nanorod LEDs (sample B).

Download Full Size | PDF

Fig. 2
Fig. 2 (a) PL spectra of planar and nanorod LEDs. Inset: Representative SEM image of InGaN nanorod LEDs. (b) Integrated PL intensity of planar and nanorod LED against excited laser power. Inset: integrated intensity ratio between nanorod and planar LEDs vs. excited laser power.

Download Full Size | PDF

Fig. 3
Fig. 3 (a) Schematic setup of the total reflectance measurement. The scattered light from the testing sample was uniformly redistributed by the integrating sphere and detected by the photon detecter. Rtotal (θ) of the nanorod and planar LEDs for TE and TM polarized light with incident laser of emitting wavelength of (b) λ = 532nm and (c) λ = 633nm.

Download Full Size | PDF

Fig. 4
Fig. 4 PL spectra vs. incited laser power for (a) sample A and (b) sample B.

Download Full Size | PDF

Fig. 5
Fig. 5 Integrated PL intensity of green and red emission vs. excited laser power for (a) sample A and (b) sample B. (c) Ratio of integrated PL intensity between red and green emission against excited laser power for both samples.

Download Full Size | PDF

Fig. 6
Fig. 6 (a) Centroid λ and (b) FWHM for both samples versus excitation power (milliwatts).

Download Full Size | PDF

Fig. 7
Fig. 7 CIE chromaticity coordinates for both samples with the excited laser power increasing from 5 to 50 mW.

Download Full Size | PDF

Select as filters
Select Topics Cancel
Top
       
© Copyright 2024 | Optica Publishing Group. All rights reserved, including rights for text and data mining and training of artificial technologies or similar technologies.
Privacy | Terms of Use