I'm trying to make an optical dissolved oxygen sensor. I need help finding an appropriate oxygen sensitive dye
This review article might be useful for your purpose:

Title: Optical methods for sensing and imaging oxygen: materials, spectroscopies and applications
Chem. Soc. Rev., 2014, 43, 3666-3761 (DOI: 10.1039/C4CS00039K)

!http://pubs.rsc.org/en/content/articlehtml/2014/cs/c4cs00039k

This is a review article with 694 references (96 pages). The discussion focused on main sections such as direct spectroscopic sensing of oxygen, absorptiometric and luminescent probes, polymeric matrices and supports, additives and related materials, spectroscopic schemes for read-out and imaging, and sensing formats (e.g., waveguide sensing, sensor arrays, multiple sensors and nanosensors). They also discuss future trends and applications, and concluded it with summary of the properties of the most often used indicator probes and polymers.

There are several probes has been discussed. Some of them may be useful to develop oxygen sensors: Those include: a) Hemoglobin and myoglobin as optical probes for oxygen (the affinity of hemoglobin for oxygen is a function of pH and ionic strength); b)  Molecular absorptiometric probes for oxygen (e.g., several cobalt–organic compounds are capable of reversibly binding molecular oxygen); c) Methods based on the oxidative power of oxygen (the reduced or "leuco" form of Methylene Blue (MB) is colorless and quickly converted back
to blue MB by oxygen); etc. 

PS: Selected irreversibly acting chromogenic probes for oxygen along with respective polymeric supports and color transitions, and Organic fluorescent probes for oxygen were also given in Table 2 &amp; 3, respectively.